81 lines
1.5 KiB
Markdown
81 lines
1.5 KiB
Markdown
---
|
|
sidebar_position: 7
|
|
title: List
|
|
---
|
|
|
|
### make
|
|
```
|
|
List.make: (number, 'a) => list<'a>
|
|
```
|
|
Returns an array of size ``n`` filled with value ``e``.
|
|
|
|
```js
|
|
List.make(4, 1) // creates the list [1, 1, 1, 1]
|
|
```
|
|
|
|
See [Rescript implementation](https://rescript-lang.org/docs/manual/latest/api/belt/array#make)
|
|
|
|
### toString
|
|
```
|
|
toString: (list<'a>) => string
|
|
```
|
|
|
|
### length
|
|
```
|
|
length: (list<'a>) => number
|
|
```
|
|
|
|
### up to
|
|
```
|
|
List.upTo: (low:number, high:number) => list<number>
|
|
```
|
|
```js
|
|
List.upTo(0, 5) // creates the list [0, 1, 2, 3, 4, 5]
|
|
```
|
|
|
|
Syntax taken from [Ruby](https://apidock.com/ruby/v2_5_5/Integer/upto).
|
|
|
|
### first
|
|
```
|
|
first: (list<'a>) => 'a
|
|
```
|
|
|
|
### last
|
|
```
|
|
last: (list<'a>) => 'a
|
|
```
|
|
|
|
### reverse
|
|
```
|
|
reverse: (list<'a>) => list<'a>
|
|
```
|
|
|
|
### map
|
|
```
|
|
map: (list<'a>, a => b) => list<'b>
|
|
```
|
|
|
|
See [Rescript implementation](https://rescript-lang.org/docs/manual/latest/api/belt/array#map).
|
|
|
|
### reduce
|
|
```
|
|
reduce: (list<'b>, 'a, ('a, 'b) => 'a) => 'a
|
|
```
|
|
``reduce(arr, init, f)``
|
|
|
|
Applies ``f`` to each element of ``arr``. The function ``f`` has two paramaters, an accumulator and the next value from the array.
|
|
|
|
```js
|
|
reduce([2, 3, 4], 1, {|acc, value| acc + value}) == 10
|
|
```
|
|
|
|
See [Rescript implementation](https://rescript-lang.org/docs/manual/latest/api/belt/array#reduce).
|
|
|
|
### reduce reverse
|
|
```
|
|
reduceReverse: (list<'b>, 'a, ('a, 'b) => 'a) => 'a
|
|
```
|
|
|
|
Works like ``reduce``, but the function is applied to each item from the last back to the first.
|
|
|
|
See [Rescript implementation](https://rescript-lang.org/docs/manual/latest/api/belt/array#reducereverse). |