109 lines
1.9 KiB
Markdown
109 lines
1.9 KiB
Markdown
---
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sidebar_position: 7
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title: List
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---
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Squiggle lists are a lot like Python lists or Ruby arrays. They accept all types.
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```javascript
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myList = [3, normal(5, 2), "random"];
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```
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### make
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```
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List.make: (number, 'a) => list<'a>
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```
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Returns an array of size `n` filled with the value.
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```js
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List.make(4, 1); // creates the list [1, 1, 1, 1]
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```
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See [Rescript implementation](https://rescript-lang.org/docs/manual/latest/api/belt/array#make)
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### toString
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```
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toString: (list<'a>) => string
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```
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### length
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```
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length: (list<'a>) => number
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```
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### upTo
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```
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List.upTo: (low:number, high:number) => list<number>
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```
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```js
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List.upTo(0, 5); // creates the list [0, 1, 2, 3, 4, 5]
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```
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Syntax taken from [Ruby](https://apidock.com/ruby/v2_5_5/Integer/upto).
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### first
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```
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first: (list<'a>) => 'a
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```
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### last
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```
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last: (list<'a>) => 'a
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```
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### reverse
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```
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reverse: (list<'a>) => list<'a>
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```
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### map
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```
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map: (list<'a>, a => b) => list<'b>
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```
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See [Rescript implementation](https://rescript-lang.org/docs/manual/latest/api/belt/array#map).
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### filter
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```
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filter: (list<'a>, 'a => bool) => list<'a>
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```
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See [Rescript implementation of keep](https://rescript-lang.org/docs/manual/latest/api/belt/array#keep), which is functionally equivalent.
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### reduce
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```
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reduce: (list<'b>, 'a, ('a, 'b) => 'a) => 'a
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```
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`reduce(arr, init, f)`
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Applies `f` to each element of `arr`. The function `f` has two paramaters, an accumulator and the next value from the array.
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```js
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reduce([2, 3, 4], 1, {|acc, value| acc + value}) == 10
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```
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See [Rescript implementation](https://rescript-lang.org/docs/manual/latest/api/belt/array#reduce).
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### reduce reverse
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```
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reduceReverse: (list<'b>, 'a, ('a, 'b) => 'a) => 'a
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```
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Works like `reduce`, but the function is applied to each item from the last back to the first.
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See [Rescript implementation](https://rescript-lang.org/docs/manual/latest/api/belt/array#reducereverse).
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