Merge branch 'develop' into collapsible

packages/components/src/components/SquiggleItem.tsx

@@ -0,0 +1,287 @@
+import * as React from "react";
+import {
+  squiggleExpression,
+  environment,
+  declaration,
+} from "@quri/squiggle-lang";
+import { NumberShower } from "./NumberShower";
+import {
+  DistributionChart,
+  DistributionPlottingSettings,
+} from "./DistributionChart";
+import { FunctionChart, FunctionChartSettings } from "./FunctionChart";
+
+function getRange<a>(x: declaration<a>) {
+  const first = x.args[0];
+  switch (first.tag) {
+    case "Float": {
+      return { floats: { min: first.value.min, max: first.value.max } };
+    }
+    case "Date": {
+      return { time: { min: first.value.min, max: first.value.max } };
+    }
+  }
+}
+
+function getChartSettings<a>(x: declaration<a>): FunctionChartSettings {
+  const range = getRange(x);
+  const min = range.floats ? range.floats.min : 0;
+  const max = range.floats ? range.floats.max : 10;
+  return {
+    start: min,
+    stop: max,
+    count: 20,
+  };
+}
+
+interface VariableBoxProps {
+  heading: string;
+  children: React.ReactNode;
+  showTypes: boolean;
+}
+
+export const VariableBox: React.FC<VariableBoxProps> = ({
+  heading = "Error",
+  children,
+  showTypes = false,
+}) => {
+  if (showTypes) {
+    return (
+      <div className="bg-white border border-grey-200 m-2">
+        <div className="border-b border-grey-200 p-3">
+          <header className="font-mono">{heading}</header>
+        </div>
+        <div className="p-3">{children}</div>
+      </div>
+    );
+  } else {
+    return <div>{children}</div>;
+  }
+};
+
+export interface SquiggleItemProps {
+  /** The input string for squiggle */
+  expression: squiggleExpression;
+  width?: number;
+  height: number;
+  distributionPlotSettings: DistributionPlottingSettings;
+  /** Whether to show type information */
+  showTypes: boolean;
+  /** Settings for displaying functions */
+  chartSettings: FunctionChartSettings;
+  /** Environment for further function executions */
+  environment: environment;
+}
+
+export const SquiggleItem: React.FC<SquiggleItemProps> = ({
+  expression,
+  width,
+  height,
+  distributionPlotSettings,
+  showTypes = false,
+  chartSettings,
+  environment,
+}) => {
+  switch (expression.tag) {
+    case "number":
+      return (
+        <VariableBox heading="Number" showTypes={showTypes}>
+          <div className="font-semibold text-slate-600">
+            <NumberShower precision={3} number={expression.value} />
+          </div>
+        </VariableBox>
+      );
+    case "distribution": {
+      const distType = expression.value.type();
+      return (
+        <VariableBox
+          heading={`Distribution (${distType})`}
+          showTypes={showTypes}
+        >
+          {distType === "Symbolic" && showTypes ? (
+            <div>{expression.value.toString()}</div>
+          ) : null}
+          <DistributionChart
+            distribution={expression.value}
+            {...distributionPlotSettings}
+            height={height}
+            width={width}
+          />
+        </VariableBox>
+      );
+    }
+    case "string":
+      return (
+        <VariableBox heading="String" showTypes={showTypes}>
+          <span className="text-slate-400">"</span>
+          <span className="text-slate-600 font-semibold">
+            {expression.value}
+          </span>
+          <span className="text-slate-400">"</span>
+        </VariableBox>
+      );
+    case "boolean":
+      return (
+        <VariableBox heading="Boolean" showTypes={showTypes}>
+          {expression.value.toString()}
+        </VariableBox>
+      );
+    case "symbol":
+      return (
+        <VariableBox heading="Symbol" showTypes={showTypes}>
+          <span className="text-slate-500 mr-2">Undefined Symbol:</span>
+          <span className="text-slate-600">{expression.value}</span>
+        </VariableBox>
+      );
+    case "call":
+      return (
+        <VariableBox heading="Call" showTypes={showTypes}>
+          {expression.value}
+        </VariableBox>
+      );
+    case "array":
+      return (
+        <VariableBox heading="Array" showTypes={showTypes}>
+          {expression.value.map((r, i) => (
+            <div key={i} className="flex pt-1">
+              <div className="flex-none bg-slate-100 rounded-sm px-1">
+                <header className="text-slate-400 font-mono">{i}</header>
+              </div>
+              <div className="px-2 mb-2 grow">
+                <SquiggleItem
+                  key={i}
+                  expression={r}
+                  width={width !== undefined ? width - 20 : width}
+                  height={50}
+                  distributionPlotSettings={distributionPlotSettings}
+                  showTypes={showTypes}
+                  chartSettings={chartSettings}
+                  environment={environment}
+                />
+              </div>
+            </div>
+          ))}
+        </VariableBox>
+      );
+    case "record":
+      return (
+        <VariableBox heading="Record" showTypes={showTypes}>
+          <div className="space-y-3">
+            {Object.entries(expression.value).map(([key, r]) => (
+              <div key={key} className="flex space-x-2">
+                <div className="flex-none">
+                  <header className="text-slate-500 font-mono">{key}:</header>
+                </div>
+                <div className="px-2 grow bg-gray-50 border border-gray-100 rounded-sm">
+                  <SquiggleItem
+                    expression={r}
+                    width={width !== undefined ? width - 20 : width}
+                    height={height / 3}
+                    showTypes={showTypes}
+                    distributionPlotSettings={distributionPlotSettings}
+                    chartSettings={chartSettings}
+                    environment={environment}
+                  />
+                </div>
+              </div>
+            ))}
+          </div>
+        </VariableBox>
+      );
+    case "arraystring":
+      return (
+        <VariableBox heading="Array String" showTypes={showTypes}>
+          {expression.value.map((r) => `"${r}"`).join(", ")}
+        </VariableBox>
+      );
+    case "date":
+      return (
+        <VariableBox heading="Date" showTypes={showTypes}>
+          {expression.value.toDateString()}
+        </VariableBox>
+      );
+    case "void":
+      return (
+        <VariableBox heading="Void" showTypes={showTypes}>
+          {"Void"}
+        </VariableBox>
+      );
+    case "timeDuration": {
+      return (
+        <VariableBox heading="Time Duration" showTypes={showTypes}>
+          <NumberShower precision={3} number={expression.value} />
+        </VariableBox>
+      );
+    }
+    case "lambda":
+      return (
+        <VariableBox heading="Function" showTypes={showTypes}>
+          <div className="text-amber-700 bg-amber-100 rounded-md font-mono p-1 pl-2 mb-3 mt-1 text-sm">{`function(${expression.value.parameters.join(
+            ","
+          )})`}</div>
+          <FunctionChart
+            fn={expression.value}
+            chartSettings={chartSettings}
+            distributionPlotSettings={distributionPlotSettings}
+            height={height}
+            environment={{
+              sampleCount: environment.sampleCount / 10,
+              xyPointLength: environment.xyPointLength / 10,
+            }}
+          />
+        </VariableBox>
+      );
+    case "lambdaDeclaration": {
+      return (
+        <VariableBox heading="Function Declaration" showTypes={showTypes}>
+          <FunctionChart
+            fn={expression.value.fn}
+            chartSettings={getChartSettings(expression.value)}
+            distributionPlotSettings={distributionPlotSettings}
+            height={height}
+            environment={{
+              sampleCount: environment.sampleCount / 10,
+              xyPointLength: environment.xyPointLength / 10,
+            }}
+          />
+        </VariableBox>
+      );
+    }
+    case "module": {
+      return (
+        <VariableBox heading="Module" showTypes={showTypes}>
+          <div className="space-y-3">
+            {Object.entries(expression.value)
+              .filter(([key, r]) => key !== "Math")
+              .map(([key, r]) => (
+                <div key={key} className="flex space-x-2">
+                  <div className="flex-none">
+                    <header className="text-slate-500 font-mono">{key}:</header>
+                  </div>
+                  <div className="px-2 grow bg-gray-50 border border-gray-100 rounded-sm">
+                    <SquiggleItem
+                      expression={r}
+                      width={width !== undefined ? width - 20 : width}
+                      height={height / 3}
+                      showTypes={showTypes}
+                      distributionPlotSettings={distributionPlotSettings}
+                      chartSettings={chartSettings}
+                      environment={environment}
+                    />
+                  </div>
+                </div>
+              ))}
+          </div>
+        </VariableBox>
+      );
+    }
+    default: {
+      return (
+        <div>
+          <span>No display for type: </span>{" "}
+          <span className="font-semibold text-slate-600">{expression.tag}</span>
+        </div>
+      );
+    }
+  }
+};

packages/components/src/components/SquiggleViewer/ExpressionViewer.tsx

@@ -154,6 +154,12 @@ export const ExpressionViewer: React.FC<Props> = ({
           {() => expression.value.toDateString()}
         </VariableBox>
       );
+    case "void":
+      return (
+        <VariableBox path={path} heading="Void">
+          {() => "Void"}
+        </VariableBox>
+      );
     case "timeDuration": {
       return (
         <VariableBox path={path} heading="Time Duration">

packages/squiggle-lang/__tests__/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn_test.res

@@ -17,14 +17,6 @@ describe("builtin", () => {
   testEval("1-1", "Ok(0)")
   testEval("2>1", "Ok(true)")
   testEval("concat('a','b')", "Ok('ab')")
-  testEval(
-    "addOne(t)=t+1; toList(mapSamples(fromSamples([1,2,3,4,5,6]), addOne))",
-    "Ok([2,3,4,5,6,7])",
-  )
-  testEval(
-    "toList(mapSamplesN([fromSamples([1,2,3,4,5,6]), fromSamples([6, 5, 4, 3, 2, 1])], {|x| x[0] > x[1] ? x[0] : x[1]}))",
-    "Ok([6,5,4,4,5,6])",
-  )
 })
 
 describe("builtin exception", () => {

packages/squiggle-lang/__tests__/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression_void_test.res

@@ -0,0 +1,20 @@
+open Jest
+open Reducer_Peggy_TestHelpers
+
+describe("Peggy void", () => {
+  //literal
+  testToExpression("()", "{()}", ~v="()", ())
+  testToExpression(
+    "fn()=1",
+    "{(:$_let_$ :fn (:$$_lambda_$$ [_] {1}))}",
+    ~v="@{fn: lambda(_=>internal code)}",
+    (),
+  )
+  testToExpression("fn()=1; fn()", "{(:$_let_$ :fn (:$$_lambda_$$ [_] {1})); (:fn ())}", ~v="1", ())
+  testToExpression(
+    "fn(a)=(); call fn(1)",
+    "{(:$_let_$ :fn (:$$_lambda_$$ [a] {()})); (:$_let_$ :_ {(:fn 1)})}",
+    ~v="@{_: (),fn: lambda(a=>internal code)}",
+    (),
+  )
+})

packages/squiggle-lang/__tests__/Reducer/Reducer_mapReduce_test.res

@@ -1,15 +1,6 @@
 open Jest
 open Reducer_TestHelpers
 
-describe("map reduce", () => {
-  testEvalToBe("double(x)=2*x; arr=[1,2,3]; map(arr, double)", "Ok([2,4,6])")
-  testEvalToBe("myadd(acc,x)=acc+x; arr=[1,2,3]; reduce(arr, 0, myadd)", "Ok(6)")
-  testEvalToBe("change(acc,x)=acc*x+x; arr=[1,2,3]; reduce(arr, 0, change)", "Ok(15)")
-  testEvalToBe("change(acc,x)=acc*x+x; arr=[1,2,3]; reduceReverse(arr, 0, change)", "Ok(9)")
-  testEvalToBe("arr=[1,2,3]; reverse(arr)", "Ok([3,2,1])")
-  testEvalToBe("check(x)=(x==2);arr=[1,2,3]; filter(arr,check)", "Ok([2])")
-})
-
 Skip.describe("map reduce (sam)", () => {
   testEvalToBe("addone(x)=x+1; map(2, addone)", "Error???")
   testEvalToBe("addone(x)=x+1; map(2, {x: addone})", "Error???")

packages/squiggle-lang/__tests__/ReducerInterface/ReducerInterface_Distribution_test.res

@@ -41,12 +41,6 @@ describe("eval on distribution functions", () => {
   describe("normalize", () => {
     testEval("normalize(normal(5,2))", "Ok(Normal(5,2))")
   })
-  describe("toPointSet", () => {
-    testEval("toPointSet(normal(5,2))", "Ok(Point Set Distribution)")
-  })
-  describe("toSampleSet", () => {
-    testEval("toSampleSet(normal(5,2), 100)", "Ok(Sample Set Distribution)")
-  })
   describe("add", () => {
     testEval("add(normal(5,2), normal(10,2))", "Ok(Normal(15,2.8284271247461903))")
     testEval("add(normal(5,2), lognormal(10,2))", "Ok(Sample Set Distribution)")

packages/squiggle-lang/__tests__/SquiggleLibrary/SquiggleLibrary_FunctionRegistryLibrary_test.res

@@ -16,6 +16,13 @@ describe("FunctionRegistry Library", () => {
     testEvalToBe("List.first([3,5,8])", "Ok(3)")
     testEvalToBe("List.last([3,5,8])", "Ok(8)")
     testEvalToBe("List.reverse([3,5,8])", "Ok([8,5,3])")
+    testEvalToBe("double(x)=2*x; arr=[1,2,3]; List.map(arr, double)", "Ok([2,4,6])")
+    testEvalToBe("double(x)=2*x; arr=[1,2,3]; map(arr, double)", "Ok([2,4,6])")
+    testEvalToBe("myadd(acc,x)=acc+x; arr=[1,2,3]; List.reduce(arr, 0, myadd)", "Ok(6)")
+    testEvalToBe("change(acc,x)=acc*x+x; arr=[1,2,3]; List.reduce(arr, 0, change)", "Ok(15)")
+    testEvalToBe("change(acc,x)=acc*x+x; arr=[1,2,3]; List.reduceReverse(arr, 0, change)", "Ok(9)")
+    testEvalToBe("check(x)=(x==2);arr=[1,2,3]; List.filter(arr,check)", "Ok([2])")
+    testEvalToBe("arr=[1,2,3]; List.reverse(arr)", "Ok([3,2,1])")
     testEvalToBe("Dist.normal(5,2)", "Ok(Normal(5,2))")
     testEvalToBe("normal(5,2)", "Ok(Normal(5,2))")
     testEvalToBe("normal({mean:5,stdev:2})", "Ok(Normal(5,2))")
@@ -53,6 +60,17 @@ describe("FunctionRegistry Library", () => {
     )
     testEvalToBe("Dist.logScore({estimate: normal(5,2), answer: 4.5})", "Ok(1.6433360626394853)")
     testEvalToBe("Dist.klDivergence(normal(5,2), normal(5,1.5))", "Ok(0.06874342818671068)")
+    testEvalToBe("SampleSet.fromList([3,5,2,3,5,2,3,5,2,3,3,5])", "Ok(Sample Set Distribution)")
+    testEvalToBe("SampleSet.fromList([3,5,2,3,5,2,3,5,2,3,3,5])", "Ok(Sample Set Distribution)")
+    testEvalToBe("SampleSet.fromFn({|| sample(normal(5,2))})", "Ok(Sample Set Distribution)")
+    testEvalToBe(
+      "addOne(t)=t+1; SampleSet.toList(SampleSet.map(SampleSet.fromList([1,2,3,4,5,6]), addOne))",
+      "Ok([2,3,4,5,6,7])",
+    )
+    testEvalToBe(
+      "SampleSet.toList(SampleSet.mapN([SampleSet.fromList([1,2,3,4,5,6]), SampleSet.fromList([6, 5, 4, 3, 2, 1])], {|x| x[0] > x[1] ? x[0] : x[1]}))",
+      "Ok([6,5,4,4,5,6])",
+    )
   })
 
   describe("Fn auto-testing", () => {

packages/squiggle-lang/package.json

@@ -20,6 +20,7 @@
     "test:ts": "jest __tests__/TS/",
     "test:rescript": "jest --modulePathIgnorePatterns=__tests__/TS/*",
     "test:watch": "jest --watchAll",
+    "test:fnRegistry": "jest __tests__/SquiggleLibrary/SquiggleLibrary_FunctionRegistryLibrary_test.bs.js",
     "coverage:rescript": "rm -f *.coverage && yarn clean && BISECT_ENABLE=yes yarn build && yarn test:rescript && bisect-ppx-report html",
     "coverage:ts": "yarn clean && yarn build && nyc --reporter=lcov yarn test:ts",
     "coverage:rescript:ci": "yarn clean && BISECT_ENABLE=yes yarn build:rescript && yarn test:rescript && bisect-ppx-report send-to Codecov",
@@ -31,6 +32,7 @@
     "format:prettier": "prettier --write .",
     "format": "yarn format:rescript && yarn format:prettier",
     "prepack": "yarn build && yarn test && yarn bundle",
+    "all:rescript": "yarn build:rescript && yarn test:rescript && yarn format:rescript",
     "all": "yarn build && yarn bundle && yarn test"
   },
   "keywords": [

packages/squiggle-lang/src/js/index.ts

@@ -120,6 +120,10 @@ function createTsExport(
   x: expressionValue,
   environment: environment
 ): squiggleExpression {
+  switch (x) {
+    case "EvVoid":
+      return tag("void", "");
+    default: {
       switch (x.tag) {
         case "EvArray":
           // genType doesn't convert anything more than 2 layers down into {tag: x, value: x}
@@ -153,7 +157,8 @@ function createTsExport(
           return tag("number", x.value);
         case "EvRecord":
           // genType doesn't support records, so we have to do the raw conversion ourself
-      let result: tagged<"record", { [key: string]: squiggleExpression }> = tag(
+          let result: tagged<"record", { [key: string]: squiggleExpression }> =
+            tag(
               "record",
               _.mapValues(x.value, (x: unknown) =>
                 convertRawToTypescript(x as rescriptExport, environment)
@@ -173,8 +178,10 @@ function createTsExport(
         case "EvTypeIdentifier":
           return tag("typeIdentifier", x.value);
         case "EvType":
-      let typeResult: tagged<"type", { [key: string]: squiggleExpression }> =
+          let typeResult: tagged<
-        tag(
+            "type",
+            { [key: string]: squiggleExpression }
+          > = tag(
             "type",
             _.mapValues(x.value, (x: unknown) =>
               convertRawToTypescript(x as rescriptExport, environment)
@@ -193,4 +200,6 @@ function createTsExport(
           );
           return moduleResult;
       }
+    }
+  }
 }

packages/squiggle-lang/src/js/rescript_interop.ts

@@ -131,7 +131,8 @@ export type squiggleExpression =
   | tagged<"record", { [key: string]: squiggleExpression }>
   | tagged<"type", { [key: string]: squiggleExpression }>
   | tagged<"typeIdentifier", string>
-  | tagged<"module", { [key: string]: squiggleExpression }>;
+  | tagged<"module", { [key: string]: squiggleExpression }>
+  | tagged<"void", string>;
 
 export { lambdaValue };
 

packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Core.res

@@ -47,6 +47,7 @@ type fnDefinition = {
     array<internalExpressionValue>,
     array<frValue>,
     GenericDist.env,
+    Reducer_Expression_T.reducerFn,
   ) => result<internalExpressionValue, string>,
 }
 
@@ -184,6 +185,9 @@ module FRType = {
   This module, Matcher, is fairly lengthy. However, only two functions from it
   are meant to be used outside of it. These are findMatches and matchToDef in Matches.Registry.
   The rest of it is just called from those two functions.
+
+  Update: This really should be completely re-done sometime, and tested. It works, but it's pretty messy. I'm sure
+  there are internal bugs, but the end functionality works, so I'm not too worried.
 */
 module Matcher = {
   module MatchSimple = {
@@ -239,7 +243,15 @@ module Matcher = {
     type definitionId = int
     type match = Match.t<array<definitionId>, definitionId>
 
-    let match = (f: function, fnName: string, args: array<internalExpressionValue>): match => {
+    let match = (
+      f: function,
+      nameSpace: option<string>,
+      fnName: string,
+      args: array<internalExpressionValue>,
+    ): match => {
+      switch nameSpace {
+      | Some(ns) if ns !== f.nameSpace => Match.DifferentName
+      | _ => {
           let matchedDefinition = () =>
             E.A.getIndexBy(f.definitions, r =>
               MatchSimple.isFullMatch(FnDefinition.match(r, fnName, args))
@@ -248,7 +260,9 @@ module Matcher = {
             let nameMatchIndexes =
               f.definitions
               ->E.A2.fmapi((index, r) =>
-            MatchSimple.isNameMatchOnly(FnDefinition.match(r, fnName, args)) ? Some(index) : None
+                MatchSimple.isNameMatchOnly(FnDefinition.match(r, fnName, args))
+                  ? Some(index)
+                  : None
               )
               ->E.A.O.concatSomes
             switch nameMatchIndexes {
@@ -263,29 +277,48 @@ module Matcher = {
           )
         }
       }
+    }
+  }
 
   module RegistryMatch = {
     type match = {
+      nameSpace: string,
       fnName: string,
       inputIndex: int,
     }
-    let makeMatch = (fnName: string, inputIndex: int) => {fnName: fnName, inputIndex: inputIndex}
+    let makeMatch = (nameSpace: string, fnName: string, inputIndex: int) => {
+      nameSpace: nameSpace,
+      fnName: fnName,
+      inputIndex: inputIndex,
+    }
   }
 
   module Registry = {
-    let _findExactMatches = (r: registry, fnName: string, args: array<internalExpressionValue>) => {
+    let _findExactMatches = (
-      let functionMatchPairs = r.functions->E.A2.fmap(l => (l, Function.match(l, fnName, args)))
+      r: registry,
+      nameSpace: option<string>,
+      fnName: string,
+      args: array<internalExpressionValue>,
+    ) => {
+      let functionMatchPairs =
+        r.functions->E.A2.fmap(l => (l, Function.match(l, nameSpace, fnName, args)))
       let fullMatch = functionMatchPairs->E.A.getBy(((_, match)) => Match.isFullMatch(match))
       fullMatch->E.O.bind(((fn, match)) =>
         switch match {
-        | FullMatch(index) => Some(RegistryMatch.makeMatch(fn.name, index))
+        | FullMatch(index) => Some(RegistryMatch.makeMatch(fn.nameSpace, fn.name, index))
         | _ => None
         }
       )
     }
 
-    let _findNameMatches = (r: registry, fnName: string, args: array<internalExpressionValue>) => {
+    let _findNameMatches = (
-      let functionMatchPairs = r.functions->E.A2.fmap(l => (l, Function.match(l, fnName, args)))
+      r: registry,
+      nameSpace: option<string>,
+      fnName: string,
+      args: array<internalExpressionValue>,
+    ) => {
+      let functionMatchPairs =
+        r.functions->E.A2.fmap(l => (l, Function.match(l, nameSpace, fnName, args)))
       let getNameMatches =
         functionMatchPairs
         ->E.A2.fmap(((fn, match)) => Match.isNameMatchOnly(match) ? Some((fn, match)) : None)
@@ -295,7 +328,7 @@ module Matcher = {
         ->E.A2.fmap(((fn, match)) =>
           switch match {
           | SameNameDifferentArguments(indexes) =>
-            indexes->E.A2.fmap(index => RegistryMatch.makeMatch(fn.name, index))
+            indexes->E.A2.fmap(index => RegistryMatch.makeMatch(fn.nameSpace, fn.name, index))
           | _ => []
           }
         )
@@ -306,22 +339,26 @@ module Matcher = {
     let findMatches = (r: registry, fnName: string, args: array<internalExpressionValue>) => {
       let fnNameInParts = Js.String.split(".", fnName)
       let fnToSearch = E.A.get(fnNameInParts, 1) |> E.O.default(fnNameInParts[0])
+      let nameSpace = E.A.length(fnNameInParts) > 1 ? Some(fnNameInParts[0]) : None
 
-      switch _findExactMatches(r, fnToSearch, args) {
+      switch _findExactMatches(r, nameSpace, fnToSearch, args) {
       | Some(r) => Match.FullMatch(r)
       | None =>
-        switch _findNameMatches(r, fnToSearch, args) {
+        switch _findNameMatches(r, nameSpace, fnToSearch, args) {
         | Some(r) => Match.SameNameDifferentArguments(r)
         | None => Match.DifferentName
         }
       }
     }
 
-    let matchToDef = (registry: registry, {fnName, inputIndex}: RegistryMatch.match): option<
+    let matchToDef = (
-      fnDefinition,
+      registry: registry,
-    > =>
+      {nameSpace, fnName, inputIndex}: RegistryMatch.match,
+    ): option<fnDefinition> =>
       registry.functions
-      ->E.A.getBy(fn => fn.name === fnName)
+      ->E.A.getBy(fn => {
+        nameSpace === fn.nameSpace && fnName === fn.name
+      })
       ->E.O.bind(fn => E.A.get(fn.definitions, inputIndex))
   }
 }
@@ -342,10 +379,15 @@ module FnDefinition = {
     }
   }
 
-  let run = (t: t, args: array<internalExpressionValue>, env: GenericDist.env) => {
+  let run = (
+    t: t,
+    args: array<internalExpressionValue>,
+    env: GenericDist.env,
+    reducer: Reducer_Expression_T.reducerFn,
+  ) => {
     let argValues = FRType.matchWithExpressionValueArray(t.inputs, args)
     switch argValues {
-    | Some(values) => t.run(args, values, env)
+    | Some(values) => t.run(args, values, env, reducer)
     | None => Error("Incorrect Types")
     }
   }
@@ -452,6 +494,7 @@ module Registry = {
     ~fnName: string,
     ~args: array<internalExpressionValue>,
     ~env: GenericDist.env,
+    ~reducer: Reducer_Expression_T.reducerFn,
   ) => {
     let relevantFunctions = Js.Dict.get(registry.fnNameDict, fnName) |> E.O.default([])
     let modified = {functions: relevantFunctions, fnNameDict: registry.fnNameDict}
@@ -468,7 +511,8 @@ module Registry = {
     }
 
     switch Matcher.Registry.findMatches(modified, fnName, args) {
-    | Matcher.Match.FullMatch(match) => match->matchToDef->E.O2.fmap(FnDefinition.run(_, args, env))
+    | Matcher.Match.FullMatch(match) =>
+      match->matchToDef->E.O2.fmap(FnDefinition.run(_, args, env, reducer))
     | SameNameDifferentArguments(m) => Some(Error(showNameMatchDefinitions(m)))
     | _ => None
     }
@@ -478,8 +522,9 @@ module Registry = {
     registry,
     (fnName, args): ReducerInterface_InternalExpressionValue.functionCall,
     env,
+    reducer: Reducer_Expression_T.reducerFn,
   ) => {
-    _matchAndRun(~registry, ~fnName, ~args, ~env)->E.O2.fmap(
+    _matchAndRun(~registry, ~fnName, ~args, ~env, ~reducer)->E.O2.fmap(
       E.R2.errMap(_, s => Reducer_ErrorValue.RETodo(s)),
     )
   }

packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Helpers.res

@@ -4,6 +4,8 @@ let impossibleError = "Wrong inputs / Logically impossible"
 
 module Wrappers = {
   let symbolic = r => DistributionTypes.Symbolic(r)
+  let pointSet = r => DistributionTypes.PointSet(r)
+  let sampleSet = r => DistributionTypes.SampleSet(r)
   let evDistribution = r => ReducerInterface_InternalExpressionValue.IEvDistribution(r)
   let evNumber = r => ReducerInterface_InternalExpressionValue.IEvNumber(r)
   let evArray = r => ReducerInterface_InternalExpressionValue.IEvArray(r)

packages/squiggle-lang/src/rescript/FunctionRegistry/FunctionRegistry_Library.res

@@ -2,6 +2,7 @@ let fnList = Belt.Array.concatMany([
   FR_Dict.library,
   FR_Dist.library,
   FR_Fn.library,
+  FR_Sampleset.library,
   FR_List.library,
   FR_Number.library,
   FR_Pointset.library,

packages/squiggle-lang/src/rescript/FunctionRegistry/Library/FR_Dict.res

@@ -52,7 +52,7 @@ let library = [
       FnDefinition.make(
         ~name="merge",
         ~inputs=[FRTypeDict(FRTypeAny), FRTypeDict(FRTypeAny)],
-        ~run=(inputs, _, _) => {
+        ~run=(inputs, _, _, _) => {
           switch inputs {
           | [IEvRecord(d1), IEvRecord(d2)] => Internals.merge(d1, d2)->Ok
           | _ => Error(impossibleError)
@@ -74,7 +74,7 @@ let library = [
       FnDefinition.make(
         ~name="mergeMany",
         ~inputs=[FRTypeArray(FRTypeDict(FRTypeAny))],
-        ~run=(_, inputs, _) =>
+        ~run=(_, inputs, _, _) =>
           inputs
           ->Prepare.ToTypedArray.dicts
           ->E.R2.fmap(E.Dict.concatMany)
@@ -96,7 +96,7 @@ let library = [
       FnDefinition.make(
         ~name="keys",
         ~inputs=[FRTypeDict(FRTypeAny)],
-        ~run=(inputs, _, _) =>
+        ~run=(inputs, _, _, _) =>
           switch inputs {
           | [IEvRecord(d1)] => Internals.keys(d1)->Ok
           | _ => Error(impossibleError)
@@ -116,7 +116,7 @@ let library = [
       FnDefinition.make(
         ~name="values",
         ~inputs=[FRTypeDict(FRTypeAny)],
-        ~run=(inputs, _, _) =>
+        ~run=(inputs, _, _, _) =>
           switch inputs {
           | [IEvRecord(d1)] => Internals.values(d1)->Ok
           | _ => Error(impossibleError)
@@ -136,7 +136,7 @@ let library = [
       FnDefinition.make(
         ~name="toList",
         ~inputs=[FRTypeDict(FRTypeAny)],
-        ~run=(inputs, _, _) =>
+        ~run=(inputs, _, _, _) =>
           switch inputs {
           | [IEvRecord(dict)] => dict->Internals.toList->Ok
           | _ => Error(impossibleError)
@@ -156,10 +156,11 @@ let library = [
       FnDefinition.make(
         ~name="fromList",
         ~inputs=[FRTypeArray(FRTypeArray(FRTypeAny))],
-        ~run=(inputs, _, _) =>
+        ~run=(inputs, _, _, _) => {
           switch inputs {
           | [IEvArray(items)] => Internals.fromList(items)
           | _ => Error(impossibleError)
+          }
         },
         (),
       ),

packages/squiggle-lang/src/rescript/FunctionRegistry/Library/FR_Dist.res

@@ -21,7 +21,8 @@ module DistributionCreation = {
       FnDefinition.make(
         ~name,
         ~inputs=[FRTypeDistOrNumber, FRTypeDistOrNumber],
-        ~run=(_, inputs, env) => inputs->Prepare.ToValueTuple.twoDistOrNumber->process(~fn, ~env),
+        ~run=(_, inputs, env, _) =>
+          inputs->Prepare.ToValueTuple.twoDistOrNumber->process(~fn, ~env),
         (),
       )
     }
@@ -30,7 +31,7 @@ module DistributionCreation = {
       FnDefinition.make(
         ~name,
         ~inputs=[FRTypeRecord([("p5", FRTypeDistOrNumber), ("p95", FRTypeDistOrNumber)])],
-        ~run=(_, inputs, env) =>
+        ~run=(_, inputs, env, _) =>
           inputs->Prepare.ToValueTuple.Record.twoDistOrNumber->process(~fn, ~env),
         (),
       )
@@ -40,7 +41,7 @@ module DistributionCreation = {
       FnDefinition.make(
         ~name,
         ~inputs=[FRTypeRecord([("mean", FRTypeDistOrNumber), ("stdev", FRTypeDistOrNumber)])],
-        ~run=(_, inputs, env) =>
+        ~run=(_, inputs, env, _) =>
           inputs->Prepare.ToValueTuple.Record.twoDistOrNumber->process(~fn, ~env),
         (),
       )
@@ -57,7 +58,8 @@ module DistributionCreation = {
       FnDefinition.make(
         ~name,
         ~inputs=[FRTypeDistOrNumber],
-        ~run=(_, inputs, env) => inputs->Prepare.ToValueTuple.oneDistOrNumber->process(~fn, ~env),
+        ~run=(_, inputs, env, _) =>
+          inputs->Prepare.ToValueTuple.oneDistOrNumber->process(~fn, ~env),
         (),
       )
   }

packages/squiggle-lang/src/rescript/FunctionRegistry/Library/FR_Fn.res

@@ -51,7 +51,7 @@ let library = [
       FnDefinition.make(
         ~name="declare",
         ~inputs=[Declaration.frType],
-        ~run=(_, inputs, _) => {
+        ~run=(_, inputs, _, _) => {
           inputs->getOrError(0)->E.R.bind(Declaration.fromExpressionValue)
         },
         (),

packages/squiggle-lang/src/rescript/FunctionRegistry/Library/FR_List.res

@@ -23,13 +23,67 @@ module Internals = {
   let reverse = (array: array<internalExpressionValue>): internalExpressionValue => IEvArray(
     Belt.Array.reverse(array),
   )
+
+  let map = (array: array<internalExpressionValue>, environment, eLambdaValue, reducer): result<
+    ReducerInterface_InternalExpressionValue.t,
+    Reducer_ErrorValue.errorValue,
+  > => {
+    let rMappedList = array->E.A.reduceReverse(Ok(list{}), (rAcc, elem) =>
+      rAcc->E.R.bind(_, acc => {
+        let rNewElem = Reducer_Expression_Lambda.doLambdaCall(
+          eLambdaValue,
+          list{elem},
+          environment,
+          reducer,
+        )
+        rNewElem->E.R2.fmap(newElem => list{newElem, ...acc})
+      })
+    )
+    rMappedList->E.R2.fmap(mappedList => mappedList->Belt.List.toArray->Wrappers.evArray)
+  }
+
+  let reduce = (aValueArray, initialValue, aLambdaValue, environment, reducer) => {
+    aValueArray->E.A.reduce(Ok(initialValue), (rAcc, elem) =>
+      rAcc->E.R.bind(_, acc =>
+        Reducer_Expression_Lambda.doLambdaCall(aLambdaValue, list{acc, elem}, environment, reducer)
+      )
+    )
+  }
+
+  let reduceReverse = (aValueArray, initialValue, aLambdaValue, environment, reducer) => {
+    aValueArray->Belt.Array.reduceReverse(Ok(initialValue), (rAcc, elem) =>
+      rAcc->Belt.Result.flatMap(acc =>
+        Reducer_Expression_Lambda.doLambdaCall(aLambdaValue, list{acc, elem}, environment, reducer)
+      )
+    )
+  }
+
+  let filter = (aValueArray, aLambdaValue, environment, reducer) => {
+    let rMappedList = aValueArray->Belt.Array.reduceReverse(Ok(list{}), (rAcc, elem) =>
+      rAcc->E.R.bind(_, acc => {
+        let rNewElem = Reducer_Expression_Lambda.doLambdaCall(
+          aLambdaValue,
+          list{elem},
+          environment,
+          reducer,
+        )
+        rNewElem->E.R2.fmap(newElem => {
+          switch newElem {
+          | IEvBool(true) => list{elem, ...acc}
+          | _ => acc
+          }
+        })
+      })
+    )
+    rMappedList->E.R2.fmap(mappedList => mappedList->Belt.List.toArray->Wrappers.evArray)
+  }
 }
 
 let library = [
   Function.make(
     ~name="make",
     ~nameSpace,
-    ~requiresNamespace,
+    ~requiresNamespace=true,
     ~output=EvtArray,
     ~examples=[`List.make(2, "testValue")`],
     ~definitions=[
@@ -37,7 +91,7 @@ let library = [
       FnDefinition.make(
         ~name="make",
         ~inputs=[FRTypeNumber, FRTypeAny],
-        ~run=(inputs, _, _) => {
+        ~run=(inputs, _, _, _) => {
           switch inputs {
           | [IEvNumber(number), value] => Internals.makeFromNumber(number, value)->Ok
           | _ => Error(impossibleError)
@@ -51,14 +105,14 @@ let library = [
   Function.make(
     ~name="upTo",
     ~nameSpace,
-    ~requiresNamespace,
+    ~requiresNamespace=true,
     ~output=EvtArray,
     ~examples=[`List.upTo(1,4)`],
     ~definitions=[
       FnDefinition.make(
         ~name="upTo",
         ~inputs=[FRTypeNumber, FRTypeNumber],
-        ~run=(_, inputs, _) =>
+        ~run=(_, inputs, _, _) =>
           inputs
           ->Prepare.ToValueTuple.twoNumbers
           ->E.R2.fmap(((low, high)) => Internals.upTo(low, high)),
@@ -70,13 +124,13 @@ let library = [
   Function.make(
     ~name="first",
     ~nameSpace,
-    ~requiresNamespace,
+    ~requiresNamespace=true,
     ~examples=[`List.first([1,4,5])`],
     ~definitions=[
       FnDefinition.make(
         ~name="first",
         ~inputs=[FRTypeArray(FRTypeAny)],
-        ~run=(inputs, _, _) =>
+        ~run=(inputs, _, _, _) =>
           switch inputs {
           | [IEvArray(array)] => Internals.first(array)
           | _ => Error(impossibleError)
@@ -89,13 +143,13 @@ let library = [
   Function.make(
     ~name="last",
     ~nameSpace,
-    ~requiresNamespace,
+    ~requiresNamespace=true,
     ~examples=[`List.last([1,4,5])`],
     ~definitions=[
       FnDefinition.make(
         ~name="last",
         ~inputs=[FRTypeArray(FRTypeAny)],
-        ~run=(inputs, _, _) =>
+        ~run=(inputs, _, _, _) =>
           switch inputs {
           | [IEvArray(array)] => Internals.last(array)
           | _ => Error(impossibleError)
@@ -115,7 +169,7 @@ let library = [
       FnDefinition.make(
         ~name="reverse",
         ~inputs=[FRTypeArray(FRTypeAny)],
-        ~run=(inputs, _, _) =>
+        ~run=(inputs, _, _, _) =>
           switch inputs {
           | [IEvArray(array)] => Internals.reverse(array)->Ok
           | _ => Error(impossibleError)
@@ -125,4 +179,87 @@ let library = [
     ],
     (),
   ),
+  Function.make(
+    ~name="map",
+    ~nameSpace,
+    ~output=EvtArray,
+    ~requiresNamespace=false,
+    ~examples=[`List.map([1,4,5], {|x| x+1})`],
+    ~definitions=[
+      FnDefinition.make(
+        ~name="map",
+        ~inputs=[FRTypeArray(FRTypeAny), FRTypeLambda],
+        ~run=(inputs, _, env, reducer) =>
+          switch inputs {
+          | [IEvArray(array), IEvLambda(lambda)] =>
+            Internals.map(array, env, lambda, reducer)->E.R2.errMap(_ => "Error!")
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="reduce",
+    ~nameSpace,
+    ~requiresNamespace=false,
+    ~examples=[`List.reduce([1,4,5], 2, {|acc, el| acc+el})`],
+    ~definitions=[
+      FnDefinition.make(
+        ~name="reduce",
+        ~inputs=[FRTypeArray(FRTypeAny), FRTypeAny, FRTypeLambda],
+        ~run=(inputs, _, env, reducer) =>
+          switch inputs {
+          | [IEvArray(array), initialValue, IEvLambda(lambda)] =>
+            Internals.reduce(array, initialValue, lambda, env, reducer)->E.R2.errMap(_ => "Error!")
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="reduceReverse",
+    ~nameSpace,
+    ~requiresNamespace=false,
+    ~examples=[`List.reduceReverse([1,4,5], 2, {|acc, el| acc-el})`],
+    ~definitions=[
+      FnDefinition.make(
+        ~name="reduceReverse",
+        ~inputs=[FRTypeArray(FRTypeAny), FRTypeAny, FRTypeLambda],
+        ~run=(inputs, _, env, reducer) =>
+          switch inputs {
+          | [IEvArray(array), initialValue, IEvLambda(lambda)] =>
+            Internals.reduceReverse(array, initialValue, lambda, env, reducer)->E.R2.errMap(_ =>
+              "Error!"
+            )
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="filter",
+    ~nameSpace,
+    ~requiresNamespace=false,
+    ~examples=[`List.filter([1,4,5], {|x| x>3})`],
+    ~definitions=[
+      FnDefinition.make(
+        ~name="filter",
+        ~inputs=[FRTypeArray(FRTypeAny), FRTypeLambda],
+        ~run=(inputs, _, env, reducer) =>
+          switch inputs {
+          | [IEvArray(array), IEvLambda(lambda)] =>
+            Internals.filter(array, lambda, env, reducer)->E.R2.errMap(_ => "Error!")
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
 ]

packages/squiggle-lang/src/rescript/FunctionRegistry/Library/FR_Number.res

@@ -9,7 +9,7 @@ module NumberToNumber = {
     FnDefinition.make(
       ~name,
       ~inputs=[FRTypeNumber],
-      ~run=(_, inputs, _) => {
+      ~run=(_, inputs, _, _) => {
         inputs
         ->getOrError(0)
         ->E.R.bind(Prepare.oneNumber)
@@ -25,7 +25,7 @@ module ArrayNumberDist = {
     FnDefinition.make(
       ~name,
       ~inputs=[FRTypeArray(FRTypeNumber)],
-      ~run=(_, inputs, _) =>
+      ~run=(_, inputs, _, _) =>
         Prepare.ToTypedArray.numbers(inputs)
         ->E.R.bind(r => E.A.length(r) === 0 ? Error("List is empty") : Ok(r))
         ->E.R.bind(fn),
@@ -36,7 +36,7 @@ module ArrayNumberDist = {
     FnDefinition.make(
       ~name,
       ~inputs=[FRTypeArray(FRTypeAny)],
-      ~run=(_, inputs, _) =>
+      ~run=(_, inputs, _, _) =>
         Prepare.ToTypedArray.numbers(inputs)
         ->E.R.bind(r => E.A.length(r) === 0 ? Error("List is empty") : Ok(r))
         ->E.R.bind(fn),

packages/squiggle-lang/src/rescript/FunctionRegistry/Library/FR_Pointset.res

@@ -1,7 +1,7 @@
 open FunctionRegistry_Core
 open FunctionRegistry_Helpers
 
-let nameSpace = "Pointset"
+let nameSpace = "PointSet"
 let requiresNamespace = true
 
 let inputsTodist = (inputs: array<FunctionRegistry_Core.frValue>, makeDist) => {
@@ -24,12 +24,41 @@ let inputsTodist = (inputs: array<FunctionRegistry_Core.frValue>, makeDist) => {
 }
 
 let library = [
+  Function.make(
+    ~name="fromDist",
+    ~nameSpace,
+    ~requiresNamespace=true,
+    ~examples=[`PointSet.fromDist(normal(5,2))`],
+    ~output=ReducerInterface_InternalExpressionValue.EvtDistribution,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="fromDist",
+        ~inputs=[FRTypeDist],
+        ~run=(_, inputs, env, _) =>
+          switch inputs {
+          | [FRValueDist(dist)] =>
+            GenericDist.toPointSet(
+              dist,
+              ~xyPointLength=env.xyPointLength,
+              ~sampleCount=env.sampleCount,
+              (),
+            )
+            ->E.R2.fmap(Wrappers.pointSet)
+            ->E.R2.fmap(Wrappers.evDistribution)
+            ->E.R2.errMap(_ => "")
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
   Function.make(
     ~name="makeContinuous",
     ~nameSpace,
     ~requiresNamespace,
     ~examples=[
-      `Pointset.makeContinuous([
+      `PointSet.makeContinuous([
         {x: 0, y: 0.2},
         {x: 1, y: 0.7},
         {x: 2, y: 0.8},
@@ -41,7 +70,7 @@ let library = [
       FnDefinition.make(
         ~name="makeContinuous",
         ~inputs=[FRTypeArray(FRTypeRecord([("x", FRTypeNumeric), ("y", FRTypeNumeric)]))],
-        ~run=(_, inputs, _) => inputsTodist(inputs, r => Continuous(Continuous.make(r))),
+        ~run=(_, inputs, _, _) => inputsTodist(inputs, r => Continuous(Continuous.make(r))),
         (),
       ),
     ],
@@ -52,7 +81,7 @@ let library = [
     ~nameSpace,
     ~requiresNamespace,
     ~examples=[
-      `Pointset.makeDiscrete([
+      `PointSet.makeDiscrete([
         {x: 0, y: 0.2},
         {x: 1, y: 0.7},
         {x: 2, y: 0.8},
@@ -64,7 +93,7 @@ let library = [
       FnDefinition.make(
         ~name="makeDiscrete",
         ~inputs=[FRTypeArray(FRTypeRecord([("x", FRTypeNumeric), ("y", FRTypeNumeric)]))],
-        ~run=(_, inputs, _) => inputsTodist(inputs, r => Discrete(Discrete.make(r))),
+        ~run=(_, inputs, _, _) => inputsTodist(inputs, r => Discrete(Discrete.make(r))),
         (),
       ),
     ],

packages/squiggle-lang/src/rescript/FunctionRegistry/Library/FR_Sampleset.res

@@ -0,0 +1,272 @@
+open FunctionRegistry_Core
+open FunctionRegistry_Helpers
+
+let nameSpace = "SampleSet"
+let requiresNamespace = true
+
+module Internal = {
+  type t = SampleSetDist.t
+  let doLambdaCall = (aLambdaValue, list, environment, reducer) =>
+    switch Reducer_Expression_Lambda.doLambdaCall(aLambdaValue, list, environment, reducer) {
+    | Ok(IEvNumber(f)) => Ok(f)
+    | _ => Error(Operation.SampleMapNeedsNtoNFunction)
+    }
+
+  let toType = (r): result<
+    ReducerInterface_InternalExpressionValue.t,
+    Reducer_ErrorValue.errorValue,
+  > =>
+    switch r {
+    | Ok(r) => Ok(Wrappers.evDistribution(SampleSet(r)))
+    | Error(r) => Error(REDistributionError(SampleSetError(r)))
+    }
+
+  //TODO: I don't know why this seems to need at least one input
+  let fromFn = (
+    aLambdaValue,
+    env: ReducerInterface_InternalExpressionValue.environment,
+    reducer,
+  ) => {
+    let sampleCount = env.sampleCount
+    let fn = r => doLambdaCall(aLambdaValue, list{IEvNumber(r)}, env, reducer)
+    Belt_Array.makeBy(sampleCount, r => fn(r->Js.Int.toFloat))->E.A.R.firstErrorOrOpen
+  }
+
+  let map1 = (sampleSetDist: t, aLambdaValue, env, reducer) => {
+    let fn = r => doLambdaCall(aLambdaValue, list{IEvNumber(r)}, env, reducer)
+    SampleSetDist.samplesMap(~fn, sampleSetDist)->toType
+  }
+
+  let map2 = (t1: t, t2: t, aLambdaValue, env, reducer) => {
+    let fn = (a, b) => doLambdaCall(aLambdaValue, list{IEvNumber(a), IEvNumber(b)}, env, reducer)
+    SampleSetDist.map2(~fn, ~t1, ~t2)->toType
+  }
+
+  let map3 = (t1: t, t2: t, t3: t, aLambdaValue, env, reducer) => {
+    let fn = (a, b, c) =>
+      doLambdaCall(aLambdaValue, list{IEvNumber(a), IEvNumber(b), IEvNumber(c)}, env, reducer)
+    SampleSetDist.map3(~fn, ~t1, ~t2, ~t3)->toType
+  }
+
+  let parseSampleSetArray = (arr: array<internalExpressionValue>): option<
+    array<SampleSetDist.t>,
+  > => {
+    let parseSampleSet = (value: internalExpressionValue): option<SampleSetDist.t> =>
+      switch value {
+      | IEvDistribution(SampleSet(dist)) => Some(dist)
+      | _ => None
+      }
+    E.A.O.openIfAllSome(E.A.fmap(parseSampleSet, arr))
+  }
+
+  let mapN = (aValueArray: array<internalExpressionValue>, aLambdaValue, env, reducer) => {
+    switch parseSampleSetArray(aValueArray) {
+    | Some(t1) =>
+      let fn = a =>
+        doLambdaCall(
+          aLambdaValue,
+          list{IEvArray(E.A.fmap(x => Wrappers.evNumber(x), a))},
+          env,
+          reducer,
+        )
+      SampleSetDist.mapN(~fn, ~t1)->toType
+    | None => Error(REFunctionNotFound(""))
+    }
+  }
+}
+
+let library = [
+  Function.make(
+    ~name="fromDist",
+    ~nameSpace,
+    ~requiresNamespace=true,
+    ~examples=[`SampleSet.fromDist(normal(5,2))`],
+    ~output=ReducerInterface_InternalExpressionValue.EvtDistribution,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="fromDist",
+        ~inputs=[FRTypeDist],
+        ~run=(_, inputs, env, _) =>
+          switch inputs {
+          | [FRValueDist(dist)] =>
+            GenericDist.toSampleSetDist(dist, env.sampleCount)
+            ->E.R2.fmap(Wrappers.sampleSet)
+            ->E.R2.fmap(Wrappers.evDistribution)
+            ->E.R2.errMap(_ => "")
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="fromList",
+    ~nameSpace,
+    ~requiresNamespace=true,
+    ~examples=[`SampleSet.fromList([3,5,2,3,5,2,3,5,2,3,3,5,3,2,3,1,1,3])`],
+    ~output=ReducerInterface_InternalExpressionValue.EvtDistribution,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="fromList",
+        ~inputs=[FRTypeArray(FRTypeNumber)],
+        ~run=(_, inputs, _, _) => {
+          let sampleSet =
+            Prepare.ToTypedArray.numbers(inputs) |> E.R2.bind(r =>
+              SampleSetDist.make(r)->E.R2.errMap(_ => "AM I HERE? WHYERE AMI??")
+            )
+          sampleSet->E.R2.fmap(Wrappers.sampleSet)->E.R2.fmap(Wrappers.evDistribution)
+        },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="toList",
+    ~nameSpace,
+    ~requiresNamespace=true,
+    ~examples=[`SampleSet.toList(SampleSet.fromDist(normal(5,2)))`],
+    ~output=ReducerInterface_InternalExpressionValue.EvtArray,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="toList",
+        ~inputs=[FRTypeDist],
+        ~run=(inputs, _, _, _) =>
+          switch inputs {
+          | [IEvDistribution(SampleSet(dist))] =>
+            dist->E.A2.fmap(Wrappers.evNumber)->Wrappers.evArray->Ok
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="fromFn",
+    ~nameSpace,
+    ~requiresNamespace=true,
+    ~examples=[`SampleSet.fromFn({|| sample(normal(5,2))})`],
+    ~output=ReducerInterface_InternalExpressionValue.EvtDistribution,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="fromFn",
+        ~inputs=[FRTypeLambda],
+        ~run=(inputs, _, env, reducer) =>
+          switch inputs {
+          | [IEvLambda(lambda)] =>
+            switch Internal.fromFn(lambda, env, reducer) {
+            | Ok(r) => Ok(r->Wrappers.sampleSet->Wrappers.evDistribution)
+            | Error(_) => Error("issue")
+            }
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="map",
+    ~nameSpace,
+    ~requiresNamespace,
+    ~examples=[`SampleSet.map(SampleSet.fromDist(normal(5,2)), {|x| x + 1})`],
+    ~output=ReducerInterface_InternalExpressionValue.EvtDistribution,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="map",
+        ~inputs=[FRTypeDist, FRTypeLambda],
+        ~run=(inputs, _, env, reducer) =>
+          switch inputs {
+          | [IEvDistribution(SampleSet(dist)), IEvLambda(lambda)] =>
+            Internal.map1(dist, lambda, env, reducer)->E.R2.errMap(_ => "")
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="map2",
+    ~nameSpace,
+    ~requiresNamespace,
+    ~examples=[
+      `SampleSet.map2(SampleSet.fromDist(normal(5,2)), SampleSet.fromDist(normal(5,2)), {|x, y| x + y})`,
+    ],
+    ~output=ReducerInterface_InternalExpressionValue.EvtDistribution,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="map2",
+        ~inputs=[FRTypeDist, FRTypeDist, FRTypeLambda],
+        ~run=(inputs, _, env, reducer) => {
+          switch inputs {
+          | [
+              IEvDistribution(SampleSet(dist1)),
+              IEvDistribution(SampleSet(dist2)),
+              IEvLambda(lambda),
+            ] =>
+            Internal.map2(dist1, dist2, lambda, env, reducer)->E.R2.errMap(_ => "")
+          | _ => Error(impossibleError)
+          }
+        },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="map3",
+    ~nameSpace,
+    ~requiresNamespace,
+    ~examples=[
+      `SampleSet.map3(SampleSet.fromDist(normal(5,2)), SampleSet.fromDist(normal(5,2)), SampleSet.fromDist(normal(5,2)), {|x, y, z| max([x,y,z])})`,
+    ],
+    ~output=ReducerInterface_InternalExpressionValue.EvtDistribution,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="map3",
+        ~inputs=[FRTypeDist, FRTypeDist, FRTypeDist, FRTypeLambda],
+        ~run=(inputs, _, env, reducer) =>
+          switch inputs {
+          | [
+              IEvDistribution(SampleSet(dist1)),
+              IEvDistribution(SampleSet(dist2)),
+              IEvDistribution(SampleSet(dist3)),
+              IEvLambda(lambda),
+            ] =>
+            Internal.map3(dist1, dist2, dist3, lambda, env, reducer)->E.R2.errMap(_ => "")
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+  Function.make(
+    ~name="mapN",
+    ~nameSpace,
+    ~requiresNamespace,
+    ~examples=[
+      `SampleSet.mapN([SampleSet.fromDist(normal(5,2)), SampleSet.fromDist(normal(5,2)), SampleSet.fromDist(normal(5,2))], {|x| max(x)})`,
+    ],
+    ~output=ReducerInterface_InternalExpressionValue.EvtDistribution,
+    ~definitions=[
+      FnDefinition.make(
+        ~name="mapN",
+        ~inputs=[FRTypeArray(FRTypeDist), FRTypeLambda],
+        ~run=(inputs, _, env, reducer) =>
+          switch inputs {
+          | [IEvArray(dists), IEvLambda(lambda)] =>
+            Internal.mapN(dists, lambda, env, reducer)->E.R2.errMap(_e => {
+              "AHHH doesn't work"
+            })
+          | _ => Error(impossibleError)
+          },
+        (),
+      ),
+    ],
+    (),
+  ),
+]

packages/squiggle-lang/src/rescript/FunctionRegistry/Library/FR_Scoring.res

@@ -30,7 +30,7 @@ let library = [
             ("prior", FRTypeDist),
           ]),
         ],
-        ~run=(_, inputs, env) => {
+        ~run=(_, inputs, env, _) => {
           switch FunctionRegistry_Helpers.Prepare.ToValueArray.Record.threeArgs(inputs) {
           | Ok([FRValueDist(estimate), FRValueDistOrNumber(FRValueDist(d)), FRValueDist(prior)]) =>
             runScoring(estimate, Score_Dist(d), Some(prior), env)
@@ -49,7 +49,7 @@ let library = [
       FnDefinition.make(
         ~name="logScore",
         ~inputs=[FRTypeRecord([("estimate", FRTypeDist), ("answer", FRTypeDistOrNumber)])],
-        ~run=(_, inputs, env) => {
+        ~run=(_, inputs, env, _) => {
           switch FunctionRegistry_Helpers.Prepare.ToValueArray.Record.twoArgs(inputs) {
           | Ok([FRValueDist(estimate), FRValueDistOrNumber(FRValueDist(d))]) =>
             runScoring(estimate, Score_Dist(d), None, env)
@@ -74,7 +74,7 @@ let library = [
       FnDefinition.make(
         ~name="klDivergence",
         ~inputs=[FRTypeDist, FRTypeDist],
-        ~run=(_, inputs, env) => {
+        ~run=(_, inputs, env, _) => {
           switch inputs {
           | [FRValueDist(estimate), FRValueDist(d)] =>
             runScoring(estimate, Score_Dist(d), None, env)

packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res

@@ -95,33 +95,7 @@ let callInternal = (call: functionCall, environment, reducer: ExpressionT.reduce
 
   let doExportBindings = (bindings: nameSpace) => bindings->Bindings.toExpressionValue->Ok
 
-  let doKeepArray = (aValueArray, aLambdaValue) => {
-    let rMappedList = aValueArray->Belt.Array.reduceReverse(Ok(list{}), (rAcc, elem) =>
-      rAcc->Result.flatMap(acc => {
-        let rNewElem = Lambda.doLambdaCall(aLambdaValue, list{elem}, environment, reducer)
-        rNewElem->Result.map(newElem =>
-          switch newElem {
-          | IEvBool(true) => list{elem, ...acc}
-          | _ => acc
-          }
-        )
-      })
-    )
-    rMappedList->Result.map(mappedList => mappedList->Belt.List.toArray->IEvArray)
-  }
-
-  let doMapArray = (aValueArray, aLambdaValue) => {
-    let rMappedList = aValueArray->Belt.Array.reduceReverse(Ok(list{}), (rAcc, elem) =>
-      rAcc->Result.flatMap(acc => {
-        let rNewElem = Lambda.doLambdaCall(aLambdaValue, list{elem}, environment, reducer)
-        rNewElem->Result.map(newElem => list{newElem, ...acc})
-      })
-    )
-    rMappedList->Result.map(mappedList => mappedList->Belt.List.toArray->IEvArray)
-  }
-
   module SampleMap = {
-    type t = SampleSetDist.t
     let doLambdaCall = (aLambdaValue, list) =>
       switch Lambda.doLambdaCall(aLambdaValue, list, environment, reducer) {
       | Ok(IEvNumber(f)) => Ok(f)
@@ -134,22 +108,6 @@ let callInternal = (call: functionCall, environment, reducer: ExpressionT.reduce
       | Error(r) => Error(REDistributionError(SampleSetError(r)))
       }
 
-    let map1 = (sampleSetDist: t, aLambdaValue) => {
-      let fn = r => doLambdaCall(aLambdaValue, list{IEvNumber(r)})
-      toType(SampleSetDist.samplesMap(~fn, sampleSetDist))
-    }
-
-    let map2 = (t1: t, t2: t, aLambdaValue) => {
-      let fn = (a, b) => doLambdaCall(aLambdaValue, list{IEvNumber(a), IEvNumber(b)})
-      SampleSetDist.map2(~fn, ~t1, ~t2)->toType
-    }
-
-    let map3 = (t1: t, t2: t, t3: t, aLambdaValue) => {
-      let fn = (a, b, c) =>
-        doLambdaCall(aLambdaValue, list{IEvNumber(a), IEvNumber(b), IEvNumber(c)})
-      SampleSetDist.map3(~fn, ~t1, ~t2, ~t3)->toType
-    }
-
     let parseSampleSetArray = (arr: array<internalExpressionValue>): option<
       array<SampleSetDist.t>,
     > => {
@@ -161,7 +119,7 @@ let callInternal = (call: functionCall, environment, reducer: ExpressionT.reduce
       E.A.O.openIfAllSome(E.A.fmap(parseSampleSet, arr))
     }
 
-    let mapN = (aValueArray: array<internalExpressionValue>, aLambdaValue) => {
+    let _mapN = (aValueArray: array<internalExpressionValue>, aLambdaValue) => {
       switch parseSampleSetArray(aValueArray) {
       | Some(t1) =>
         let fn = a => doLambdaCall(aLambdaValue, list{IEvArray(E.A.fmap(x => IEvNumber(x), a))})
@@ -172,22 +130,6 @@ let callInternal = (call: functionCall, environment, reducer: ExpressionT.reduce
     }
   }
 
-  let doReduceArray = (aValueArray, initialValue, aLambdaValue) => {
-    aValueArray->Belt.Array.reduce(Ok(initialValue), (rAcc, elem) =>
-      rAcc->Result.flatMap(acc =>
-        Lambda.doLambdaCall(aLambdaValue, list{acc, elem}, environment, reducer)
-      )
-    )
-  }
-
-  let doReduceReverseArray = (aValueArray, initialValue, aLambdaValue) => {
-    aValueArray->Belt.Array.reduceReverse(Ok(initialValue), (rAcc, elem) =>
-      rAcc->Result.flatMap(acc =>
-        Lambda.doLambdaCall(aLambdaValue, list{acc, elem}, environment, reducer)
-      )
-    )
-  }
-
   switch call {
   | ("$_atIndex_$", [IEvArray(aValueArray), IEvNumber(fIndex)]) => arrayAtIndex(aValueArray, fIndex)
   | ("$_atIndex_$", [IEvBindings(dict), IEvString(sIndex)]) => moduleAtIndex(dict, sIndex)
@@ -226,38 +168,6 @@ let callInternal = (call: functionCall, environment, reducer: ExpressionT.reduce
     doAddString(aValueString, bValueString)
   | ("inspect", [value, IEvString(label)]) => inspectLabel(value, label)
   | ("inspect", [value]) => inspect(value)
-  | ("filter", [IEvArray(aValueArray), IEvLambda(aLambdaValue)]) =>
-    doKeepArray(aValueArray, aLambdaValue)
-  | ("map", [IEvArray(aValueArray), IEvLambda(aLambdaValue)]) =>
-    doMapArray(aValueArray, aLambdaValue)
-  | ("mapSamples", [IEvDistribution(SampleSet(dist)), IEvLambda(aLambdaValue)]) =>
-    SampleMap.map1(dist, aLambdaValue)
-  | (
-      "mapSamples2",
-      [
-        IEvDistribution(SampleSet(dist1)),
-        IEvDistribution(SampleSet(dist2)),
-        IEvLambda(aLambdaValue),
-      ],
-    ) =>
-    SampleMap.map2(dist1, dist2, aLambdaValue)
-  | (
-      "mapSamples3",
-      [
-        IEvDistribution(SampleSet(dist1)),
-        IEvDistribution(SampleSet(dist2)),
-        IEvDistribution(SampleSet(dist3)),
-        IEvLambda(aLambdaValue),
-      ],
-    ) =>
-    SampleMap.map3(dist1, dist2, dist3, aLambdaValue)
-  | ("mapSamplesN", [IEvArray(aValueArray), IEvLambda(aLambdaValue)]) =>
-    SampleMap.mapN(aValueArray, aLambdaValue)
-  | ("reduce", [IEvArray(aValueArray), initialValue, IEvLambda(aLambdaValue)]) =>
-    doReduceArray(aValueArray, initialValue, aLambdaValue)
-  | ("reduceReverse", [IEvArray(aValueArray), initialValue, IEvLambda(aLambdaValue)]) =>
-    doReduceReverseArray(aValueArray, initialValue, aLambdaValue)
-  | ("reverse", [IEvArray(aValueArray)]) => aValueArray->Belt.Array.reverse->IEvArray->Ok
   | (_, [IEvBool(_)])
   | (_, [IEvNumber(_)])
   | (_, [IEvString(_)])

packages/squiggle-lang/src/rescript/Reducer/Reducer_Expression/Reducer_Expression_ExpressionBuilder.res

@@ -82,3 +82,5 @@ let eIdentifier = (name: string): expression =>
 
 let eTypeIdentifier = (name: string): expression =>
   name->BInternalExpressionValue.IEvTypeIdentifier->BExpressionT.EValue
+
+let eVoid: expression = BInternalExpressionValue.IEvVoid->BExpressionT.EValue

packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.peggy

@@ -5,7 +5,6 @@
 }}
 
 start
-  // = _nl start:typeExpression _nl finalComment?  {return start}
   = _nl start:outerBlock _nl finalComment?  {return start}
 
 zeroOMoreArgumentsBlockOrExpression = innerBlockOrExpression / lambda
@@ -39,6 +38,12 @@ statement
   = letStatement
   / defunStatement
   / typeStatement
+  / voidStatement
+
+voidStatement 
+  = "call" _nl value:zeroOMoreArgumentsBlockOrExpression
+    { var variable = h.nodeIdentifier("_", location());
+      return h.nodeLetStatement(variable, value); }
 
 letStatement 
   = variable:identifier _ assignmentOp _nl value:zeroOMoreArgumentsBlockOrExpression
@@ -54,6 +59,8 @@ defunStatement
 array_parameters 
   = head:dollarIdentifier tail:(_ ',' _nl @dollarIdentifier)* 
     { return [head, ...tail]; }
+  / ""
+    { return [h.nodeIdentifier("_", location())]; }
 
 expression = ifthenelse / ternary / logicalAdditive
 
@@ -172,6 +179,8 @@ collectionElement
     array_functionArguments 
       = head:expression tail:(_ ',' _nl @expression)* 
       { return [head, ...tail]; }
+  / ""
+      {return [h.nodeVoid()];}
 
 atom
   = '(' _nl expression:expression _nl ')' {return expression}
@@ -185,6 +194,10 @@ basicLiteral
   / boolean
   / dollarIdentifierWithModule
   / dollarIdentifier
+  / voidLiteral
+
+voidLiteral 'void'
+  = "()" {return h.nodeVoid();}
 
 dollarIdentifierWithModule 'identifier'
   = head:$moduleIdentifier 
@@ -195,7 +208,7 @@ dollarIdentifierWithModule 'identifier'
     modifiers.unshift(head)
     modifiers.push(final)
     let modifiedIdentifier = modifiers.join('.')
-    return h.nodeIdentifier(modifiedIdentifier)
+    return h.nodeIdentifier(modifiedIdentifier, location())
   }
 
 identifier 'identifier'

packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_Parse.res

@@ -34,6 +34,7 @@ type nodeModuleIdentifier = {...node, "value": string}
 type nodeString = {...node, "value": string}
 type nodeTernary = {...node, "condition": node, "trueExpression": node, "falseExpression": node}
 type nodeTypeIdentifier = {...node, "value": string}
+type nodeVoid = node
 
 type peggyNode =
   | PgNodeBlock(nodeBlock)
@@ -50,6 +51,7 @@ type peggyNode =
   | PgNodeString(nodeString)
   | PgNodeTernary(nodeTernary)
   | PgNodeTypeIdentifier(nodeTypeIdentifier)
+  | PgNodeVoid(nodeVoid)
 
 external castNodeBlock: node => nodeBlock = "%identity"
 external castNodeBoolean: node => nodeBoolean = "%identity"
@@ -65,6 +67,7 @@ external castNodeModuleIdentifier: node => nodeModuleIdentifier = "%identity"
 external castNodeString: node => nodeString = "%identity"
 external castNodeTernary: node => nodeTernary = "%identity"
 external castNodeTypeIdentifier: node => nodeTypeIdentifier = "%identity"
+external castNodeVoid: node => nodeVoid = "%identity"
 
 exception UnsupportedPeggyNodeType(string) // This should never happen; programming error
 let castNodeType = (node: node) =>
@@ -83,6 +86,7 @@ let castNodeType = (node: node) =>
   | "String" => node->castNodeString->PgNodeString
   | "Ternary" => node->castNodeTernary->PgNodeTernary
   | "TypeIdentifier" => node->castNodeTypeIdentifier->PgNodeTypeIdentifier
+  | "Void" => node->castNodeVoid->PgNodeVoid
   | _ => raise(UnsupportedPeggyNodeType(node["type"]))
   }
 
@@ -116,6 +120,7 @@ let rec pgToString = (peggyNode: peggyNode): string => {
     " " ++
     toString(node["falseExpression"]) ++ ")"
   | PgNodeTypeIdentifier(node) => `#${node["value"]}`
+  | PgNodeVoid(_node) => "()"
   }
 }
 and toString = (node: node): string => node->castNodeType->pgToString

packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_ToExpression.res

@@ -48,5 +48,6 @@ let rec fromNode = (node: Parse.node): expression => {
     )
   | PgNodeTypeIdentifier(nodeTypeIdentifier) =>
     ExpressionBuilder.eTypeIdentifier(nodeTypeIdentifier["value"])
+  | PgNodeVoid(_) => ExpressionBuilder.eVoid
   }
 }

packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/helpers.ts

@@ -213,3 +213,7 @@ export function nodeTernary(
 export function nodeTypeIdentifier(typeValue: string) {
   return { type: "TypeIdentifier", value: typeValue };
 }
+
+export function nodeVoid() {
+  return { type: "Void" };
+}

packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_ExternalExpressionValue.res

@@ -25,6 +25,7 @@ type rec externalExpressionValue =
   | EvTypeIdentifier(string)
   | EvModule(record)
   | EvType(record)
+  | EvVoid
 and record = Js.Dict.t<externalExpressionValue>
 and externalBindings = record
 and lambdaValue = {
@@ -63,6 +64,7 @@ let rec toString = aValue =>
   | EvTimeDuration(t) => DateTime.Duration.toString(t)
   | EvType(t) => `type${t->toStringRecord}`
   | EvTypeIdentifier(id) => `#${id}`
+  | EvVoid => `()`
   }
 and toStringRecord = aRecord => {
   let pairs =

packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_ExternalLibrary.res

@@ -4,16 +4,18 @@ type internalExpressionValue = InternalExpressionValue.t
 /*
   Map external calls of Reducer
 */
-let dispatch = (call: InternalExpressionValue.functionCall, environment, reducer, chain): result<
+let dispatch = (
-  internalExpressionValue,
+  call: InternalExpressionValue.functionCall,
-  'e,
+  environment,
-> => {
+  reducer: Reducer_Expression_T.reducerFn,
+  chain,
+): result<internalExpressionValue, 'e> => {
   E.A.O.firstSomeFn([
     () => ReducerInterface_GenericDistribution.dispatch(call, environment),
     () => ReducerInterface_Date.dispatch(call, environment),
     () => ReducerInterface_Duration.dispatch(call, environment),
     () => ReducerInterface_Number.dispatch(call, environment),
-    () => FunctionRegistry_Library.dispatch(call, environment),
+    () => FunctionRegistry_Library.dispatch(call, environment, reducer),
   ])->E.O2.default(chain(call, environment, reducer))
 }
 

packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_GenericDistribution.res

@@ -233,19 +233,6 @@ let dispatchToGenericOutput = (call: IEV.functionCall, env: GenericDist.env): op
   | ("inv", [IEvDistribution(dist), IEvNumber(float)]) => Helpers.toFloatFn(#Inv(float), dist, ~env)
   | ("quantile", [IEvDistribution(dist), IEvNumber(float)]) =>
     Helpers.toFloatFn(#Inv(float), dist, ~env)
-  | ("toSampleSet", [IEvDistribution(dist), IEvNumber(float)]) =>
-    Helpers.toDistFn(ToSampleSet(Belt.Int.fromFloat(float)), dist, ~env)
-  | ("toSampleSet", [IEvDistribution(dist)]) =>
-    Helpers.toDistFn(ToSampleSet(env.sampleCount), dist, ~env)
-  | ("toList", [IEvDistribution(SampleSet(dist))]) => Some(FloatArray(SampleSetDist.T.get(dist)))
-  | ("fromSamples", [IEvArray(inputArray)]) => {
-      let _wrapInputErrors = x => SampleSetDist.NonNumericInput(x)
-      let parsedArray = Helpers.parseNumberArray(inputArray)->E.R2.errMap(_wrapInputErrors)
-      switch parsedArray {
-      | Ok(array) => DistributionOperation.run(FromSamples(array), ~env)
-      | Error(e) => GenDistError(SampleSetError(e))
-      }->Some
-    }
   | ("inspect", [IEvDistribution(dist)]) => Helpers.toDistFn(Inspect, dist, ~env)
   | ("truncateLeft", [IEvDistribution(dist), IEvNumber(float)]) =>
     Helpers.toDistFn(Truncate(Some(float), None), dist, ~env)

packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_InternalExpressionValue.res

@@ -23,6 +23,7 @@ type rec t =
   | IEvTimeDuration(float)
   | IEvType(map)
   | IEvTypeIdentifier(string)
+  | IEvVoid
 and map = Belt.Map.String.t<t>
 and nameSpace = NameSpace(Belt.Map.String.t<t>)
 and lambdaValue = {
@@ -60,6 +61,7 @@ let rec toString = aValue =>
   | IEvType(aMap) => aMap->toStringMap
   | IEvTimeDuration(t) => DateTime.Duration.toString(t)
   | IEvTypeIdentifier(id) => `#${id}`
+  | IEvVoid => `()`
   }
 and toStringMap = aMap => {
   let pairs =
@@ -92,6 +94,7 @@ let toStringWithType = aValue =>
   | IEvTimeDuration(_) => `Date::${toString(aValue)}`
   | IEvType(_) => `Type::${toString(aValue)}`
   | IEvTypeIdentifier(_) => `TypeIdentifier::${toString(aValue)}`
+  | IEvVoid => `Void`
   }
 
 let argsToString = (args: array<t>): string => {
@@ -135,6 +138,7 @@ type internalExpressionValueType =
   | EvtTimeDuration
   | EvtType
   | EvtTypeIdentifier
+  | EvtVoid
 
 type functionCallSignature = CallSignature(string, array<internalExpressionValueType>)
 type functionDefinitionSignature =
@@ -158,6 +162,7 @@ let valueToValueType = value =>
   | IEvTimeDuration(_) => EvtTimeDuration
   | IEvType(_) => EvtType
   | IEvTypeIdentifier(_) => EvtTypeIdentifier
+  | IEvVoid => EvtVoid
   }
 
 let externalValueToValueType = (value: ExternalExpressionValue.t) =>
@@ -178,6 +183,7 @@ let externalValueToValueType = (value: ExternalExpressionValue.t) =>
   | EvTimeDuration(_) => EvtTimeDuration
   | EvType(_) => EvtType
   | EvTypeIdentifier(_) => EvtTypeIdentifier
+  | EvVoid => EvtVoid
   }
 
 let functionCallToCallSignature = (functionCall: functionCall): functionCallSignature => {
@@ -203,6 +209,7 @@ let valueTypeToString = (valueType: internalExpressionValueType): string =>
   | EvtTimeDuration => `Duration`
   | EvtType => `Type`
   | EvtTypeIdentifier => `TypeIdentifier`
+  | EvtVoid => `Void`
   }
 
 let functionCallSignatureToString = (functionCallSignature: functionCallSignature): string => {
@@ -232,6 +239,7 @@ let rec toExternal = (iev: t): ExternalExpressionValue.t => {
   | IEvType(v) => v->mapToExternal->EvType
   | IEvTypeIdentifier(v) => EvTypeIdentifier(v)
   | IEvBindings(v) => v->nameSpaceToTypeScriptBindings->EvModule
+  | IEvVoid => EvVoid
   }
 }
 and mapToExternal = v =>
@@ -271,6 +279,7 @@ let rec toInternal = (ev: ExternalExpressionValue.t): t => {
   | EvTimeDuration(v) => IEvTimeDuration(v)
   | EvType(v) => v->recordToInternal->IEvType
   | EvTypeIdentifier(v) => IEvTypeIdentifier(v)
+  | EvVoid => IEvVoid
   }
 }
 and recordToInternal = v =>

packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_StdLib.res

@@ -1,6 +1,6 @@
 module Bindings = Reducer_Bindings
 
-let internalStdLib = Bindings.emptyBindings->SquiggleLibrary_Math.makeBindings
+let internalStdLib = Bindings.emptyBindings->SquiggleLibrary_Math.makeBindings->SquiggleLibrary_Versions.makeBindings
 
 @genType
 let externalStdLib = internalStdLib->Bindings.toTypeScriptBindings

packages/squiggle-lang/src/rescript/SquiggleLibrary/SquiggleLibrary_Versions.res

@@ -0,0 +1,9 @@
+module Bindings = Reducer_Bindings
+
+let bindings: Bindings.t =
+  [
+    ("System.version", ReducerInterface_InternalExpressionValue.IEvString("0.2.12")),
+  ]->Bindings.fromArray
+
+let makeBindings = (previousBindings: Bindings.t): Bindings.t =>
+  previousBindings->Bindings.merge(bindings)

packages/squiggle-lang/src/rescript/Utility/E.res

@@ -546,6 +546,7 @@ module A = {
   let slice = Belt.Array.slice
   let init = Array.init
   let reduce = Belt.Array.reduce
+  let reduceReverse = Belt.Array.reduceReverse
   let reducei = Belt.Array.reduceWithIndex
   let some = Belt.Array.some
   let isEmpty = r => length(r) < 1

packages/website/docs/Api/Date.md

@@ -5,16 +5,14 @@ title: Date
 
 Squiggle date types are a very simple implementation on [Javascript's Date type](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date). It's mainly here for early experimentation. There are more relevant functions for the [Duration](/docs/Api/Duration) type.
 
-### makeFromYear
+### fromYear
-
-(Now `makeDateFromYear`)
 
 ```
-Date.makeFromYear: (number) => date
+Date.fromYear: (number) => date
 ```
 
 ```js
-makeFromYear(2022.32);
+Date.fromYear(2022.32);
 ```
 
 ### toString
@@ -30,7 +28,7 @@ add: (date, duration) => date
 ```
 
 ```js
-makeFromYear(2022.32) + years(5);
+Date.fromYear(2022.32) + years(5);
 ```
 
 ### subtract
@@ -41,6 +39,6 @@ subtract: (date, duration) => date
 ```
 
 ```js
-makeFromYear(2040) - makeFromYear(2020); // 20 years
+Date.fromYear(2040) - Date.fromYear(2020); // 20 years
-makeFromYear(2040) - years(20); // 2020
+Date.fromYear(2040) - years(20); // 2020
 ```

packages/website/docs/Api/DistGeneric.mdx

@@ -290,38 +290,6 @@ quantile: (distribution, number) => number
 quantile(normal(5, 2), 0.5);
 ```
 
-### toPointSet
-
-**TODO: Will soon be called "PointSet.make"**
-
-Converts a distribution to the pointSet format.
-
-```
-toPointSet: (distribution) => pointSetDistribution
-```
-
-**Examples**
-
-```javascript
-toPointSet(normal(5, 2));
-```
-
-### toSampleSet
-
-**TODO: Will soon be called "SampleSet.make"**
-
-Converts a distribution to the sampleSet format, with n samples.
-
-```
-toSampleSet: (distribution, number) => sampleSetDistribution
-```
-
-**Examples**
-
-```javascript
-toSampleSet(normal(5, 2), 1000);
-```
-
 ### truncateLeft
 
 Truncates the left side of a distribution. Returns either a pointSet distribution or a symbolic distribution.
@@ -364,6 +332,26 @@ klDivergence: (distribution, distribution) => number
 klDivergence(normal(5, 2), normal(5, 4)); // returns 0.57
 ```
 
+### logScore
+
+A log loss score. Often that often acts as a [scoring rule](https://en.wikipedia.org/wiki/Scoring_rule). Useful when evaluating the accuracy of a forecast.
+
+Note that it is fairly slow.
+
+```
+logScore: ({estimate: distribution, ?prior: distribution, answer: distribution|number}) => number
+```
+
+**Examples**
+
+```javascript
+Dist.logScore({
+  estimate: normal(5, 2),
+  answer: normal(4.5, 1.2),
+  prior: normal(6, 4),
+}); // returns -0.597.57
+```
+
 ## Display
 
 ### toString
@@ -392,20 +380,6 @@ sparkline: (distribution, n = 20) => string
 toSparkline(truncateLeft(normal(5, 2), 3), 20); // produces ▁▇█████▇▅▄▃▂▂▁▁▁▁▁▁▁
 ```
 
-### inspect
-
-Prints the value of the distribution to the Javascript console, then returns the distribution. Useful for debugging.
-
-```
-inspect: (distribution) => distribution
-```
-
-**Examples**
-
-```javascript
-inspect(normal(5, 2)); // logs "normal(5, 2)" to the javascript console and returns the distribution.
-```
-
 ## Normalization
 
 There are some situations where computation will return unnormalized distributions. This means that their cumulative sums are not equal to 1.0. Unnormalized distributions are not valid for many relevant functions; for example, klDivergence and scoring.
@@ -414,7 +388,7 @@ The only functions that do not return normalized distributions are the pointwise
 
 ### normalize
 
-Normalize a distribution. This means scaling it appropriately so that it's cumulative sum is equal to 1.
+Normalize a distribution. This means scaling it appropriately so that it's cumulative sum is equal to 1. This only impacts Pointset distributions, because those are the only ones that can be non-normlized.
 
 ```
 normalize: (distribution) => distribution
@@ -606,75 +580,3 @@ dotPow: (distributionLike, distributionLike) => distribution
 ```
 dotExp: (distributionLike, distributionLike) => distribution
 ```
-
-## Scale Arithmetic Operations
-
-<Admonition type="caution" title="Likely to change">
-  <p>
-    We're planning on removing scale operations in favor of more general
-    functions soon.
-  </p>
-</Admonition>
-
-Scale operations are similar to pointwise operations, but operate on a constant y-value instead of y-values coming from a distribution. You can think about this as scaling a distribution vertically by a constant.
-
-The following items would be equivalent.
-
-```js
-scalePow(normal(5,2), 2)
-mapY(normal(5,2), {|y| y ^ 2}) // Not yet available
-```
-
-### scaleMultiply
-
-```
-scaleMultiply: (distributionLike, number) => distribution
-```
-
-### scalePow
-
-```
-scalePow: (distributionLike, number) => distribution
-```
-
-### scaleExp
-
-```
-scaleExp: (distributionLike, number) => distribution
-```
-
-### scaleLog
-
-```
-scaleLog: (distributionLike, number) => distribution
-```
-
-### scaleLog10
-
-```
-scaleLog10: (distributionLike, number) => distribution
-```
-
-## Special
-
-### Declaration (Continuous Functions)
-
-Adds metadata to a function of the input ranges. Works now for numeric and date inputs. This is useful when making formal predictions. It allows you to limit the domain that your prediction will be used and scored within.
-
-Declarations are currently experimental and will likely be removed or changed in the future.
-
-```
-declareFn: (dict<{fn: lambda, inputs: array<dict<{min: number, max: number}>>}>) => declaration
-```
-
-**Examples**
-
-```javascript
-declareFn({
-  fn: {|a,b| a },
-  inputs: [
-    {min: 0, max: 100},
-    {min: 30, max: 50}
-  ]
-})
-```

packages/website/docs/Api/DistPointSet.md

@@ -3,26 +3,20 @@ sidebar_position: 4
 title: Point Set Distribution
 ---
 
-:::danger
-These functions aren't yet implemented with these specific names. This should be changed soon
-:::
-
 Point set distributions are one of the three distribution formats. They are stored as a list of x-y coordinates representing both discrete and continuous distributions.
 
 One complication is that it's possible to represent invalid probability distributions in the point set format. For example, you can represent shapes with negative values, or shapes that are not normalized.
 
-### make
+### fromDist
 
 Converts the distribution in question into a point set distribution. If the distribution is symbolic, then it does this by taking the quantiles. If the distribution is a sample set, then it uses a version of kernel density estimation to approximate the point set format. One complication of this latter process is that if there is a high proportion of overlapping samples (samples that are exactly the same as each other), it will convert these samples into discrete point masses. Eventually we'd like to add further methods to help adjust this process.
 
 ```
-PointSet.make: (distribution) => pointSetDist
+PointSet.fromDist: (distribution) => pointSetDist
 ```
 
 ### makeContinuous
 
-**TODO: Now called "toContinuousPointSet"**
-
 Converts a set of x-y coordinates directly into a continuous distribution.
 
 ```
@@ -40,10 +34,6 @@ PointSet.makeContinuous([
 
 ### makeDiscrete
 
-**TODO: Now called "toDiscretePointSet"**
-
-Converts a set of x-y coordinates directly into a discrete distribution.
-
 ```
 PointSet.makeDiscrete: (list<{x: number, y: number}>) => pointSetDist
 ```

packages/website/docs/Api/DistSampleSet.md

@@ -3,22 +3,42 @@ sidebar_position: 5
 title: Sample Set Distribution
 ---
 
-:::danger
-These functions aren't yet implemented with these specific names. This should be added soon.
-:::
-
 Sample set distributions are one of the three distribution formats. Internally, they are stored as a list of numbers. It's useful to distinguish point set distributions from arbitrary lists of numbers to make it clear which functions are applicable.
 
 Monte Carlo calculations typically result in sample set distributions.
 
 All regular distribution function work on sample set distributions. In addition, there are several functions that only work on sample set distributions.
 
-### make
+### fromDist
 
 ```
-SampleSet.make: (distribution) => sampleSet
+SampleSet.fromDist: (list<number>) => sampleSet
-SampleSet.make: (list<number>) => sampleSet
+```
-SampleSet.make: (() => number) => sampleSet // not yet implemented
+
+### fromList
+
+```
+SampleSet.fromList: (list<number>) => sampleSet
+```
+
+### fromFn
+
+```
+SampleSet.fromFn: ((float) => number) => sampleSet
+```
+
+### toList
+
+```
+SampleSet.toList: (sampleSet) => list<number>
+```
+
+Gets the internal samples of a sampleSet distribution. This is separate from the sampleN() function, which would shuffle the samples. toList() maintains order and length.
+
+**Examples**
+
+```
+toList(toSampleSet(normal(5,2)))
 ```
 
 ### map
@@ -39,16 +59,8 @@ SampleSet.map2: (sampleSet, sampleSet, ((number, number) => number)) => sampleSe
 SampleSet.map3: (sampleSet, sampleSet, sampleSet, ((number, number, number) => number)) => sampleSet
 ```
 
-### toList
+### mapN
 
 ```
-SampleSet.toList: (sampleSet) => list<number>
+SampleSet.mapN: (list<sampleSet>, (list<sampleSet> => number)) => sampleSet
-```
-
-Gets the internal samples of a sampleSet distribution. This is separate from the sampleN() function, which would shuffle the samples. toList() maintains order and length.
-
-**Examples**
-
-```
-toList(toSampleSet(normal(5,2)))
 ```

packages/website/docs/Api/Function.md

@@ -0,0 +1,27 @@
+---
+sidebar_position: 6
+title: Function
+---
+
+## declare (experimental)
+
+Adds metadata to a function of the input ranges. Works now for numeric and date inputs. This is useful when making formal predictions. It allows you to limit the domain that your prediction will be used and scored within.
+
+The one function that declarations currently have is that they impact plotting. If you `declare` a single-variable function within a specific range, this specific range will be plotted.
+
+Declarations are currently experimental and will likely be removed or changed in the future.
+
+```
+Function.declare: (dict<{fn: lambda, inputs: array<dict<{min: number, max: number}>>}>) => declaration
+```
+
+**Examples**
+
+```javascript
+Function.declare({
+  fn: {|a| a+10 },
+  inputs: [
+    {min: 30, max: 100}
+  ]
+})
+```

packages/website/docs/Api/List.md

@@ -11,8 +11,6 @@ myList = [3, normal(5, 2), "random"];
 
 ### make
 
-**Note: currently just called `makeList`, without the preix**
-
 ```
 List.make: (number, 'a) => list<'a>
 ```
@@ -37,9 +35,7 @@ toString: (list<'a>) => string
 length: (list<'a>) => number
 ```
 
-### up to
+### upTo
-
-**Note: currently just called `upTo`, without the preix**
 
 ```
 List.upTo: (low:number, high:number) => list<number>

packages/website/docs/Api/Number.mdx

@@ -55,6 +55,12 @@ min: (list<number>) => number
 mean: (list<number>) => number
 ```
 
+### geometric mean
+
+```
+geomean: (list<number>) => number
+```
+
 ### stdev
 
 ```
@@ -117,6 +123,12 @@ product: (list<number>) => number
 cumprod: (list<number>) => list<number>
 ```
 
+### diff
+
+```
+diff: (list<number>) => list<number>
+```
+
 ### subtract
 
 ```

yarn.lock

@@ -17151,9 +17151,9 @@ terser-webpack-plugin@^5.0.3, terser-webpack-plugin@^5.1.3, terser-webpack-plugi
     terser "^5.7.2"
 
 terser@^4.1.2, terser@^4.6.3:
-  version "4.8.0"
+  version "4.8.1"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.0.tgz#63056343d7c70bb29f3af665865a46fe03a0df17"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.1.tgz#a00e5634562de2239fd404c649051bf6fc21144f"
-  integrity sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==
+  integrity sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==
   dependencies:
     commander "^2.20.0"
     source-map "~0.6.1"