Documentation

array.filter() function

array.filter() is experimental and subject to change at any time. By using this function, you accept the risks of experimental functions.

array.filter() iterates over an array, evaluates each element with a predicate function, and then returns a new array with only elements that match the predicate.

Function type signature
(<-arr: [A], fn: (x: A) => bool) => [A]
For more information, see Function type signatures.

Parameters

arr

Array to filter. Default is the piped-forward array (<-).

fn

(Required) Predicate function to evaluate on each element. The element is represented by x in the predicate function.

Examples

Filter array of integers

import "experimental/array"

a = [
    1,
    2,
    3,
    4,
    5,
]
b = a |> array.filter(fn: (x) => x >= 3)

// b returns [3, 4, 5]
// Output the filtered array as a table
array.from(rows: b |> array.map(fn: (x) => ({_value: x})))

View example output


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