partition | /collections/partition.ts | std@0.223.0

Module

std/collections/partition.ts>partition

The Deno Standard Library

denoland/deno_std

Latest

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function partition

import { partition } from "https://deno.land/std@0.223.0/collections/partition.ts";

partition<T>(array: Iterable<T>, predicate: (el: T) => boolean): [T[], T[]]

Returns a tuple of two arrays with the first one containing all elements in the given array that match the given predicate and the second one containing all that do not.

partition<T, U extends T>(array: Iterable<T>, predicate: (el: T) => el is U): [U[], Exclude<T, U>[]]

Returns a tuple of two arrays with the first one containing all elements in the given array that match the given predicate and the second one containing all that do not.

Examples

Example 1

import { partition } from "https://deno.land/std@0.223.0/collections/partition.ts";
import { assertEquals } from "https://deno.land/std@0.223.0/assert/assert_equals.ts";

const numbers = [5, 6, 7, 8, 9];
const [even, odd] = partition(numbers, (it) => it % 2 === 0);

assertEquals(even, [6, 8]);
assertEquals(odd, [5, 7, 9]);

Type Parameters

Parameters

array: Iterable<T>

predicate: (el: T) => boolean

Returns

[T[], T[]]

Returns a tuple of two arrays with the first one containing all elements in the given array that match the given predicate and the second one containing all that do not.

Examples

Example 1

import { partition } from "https://deno.land/std@0.223.0/collections/partition.ts";
import { assertEquals } from "https://deno.land/std@0.223.0/assert/assert_equals.ts";

const numbers = [5, 6, 7, 8, 9];
const [even, odd] = partition(numbers, (it) => it % 2 === 0);

assertEquals(even, [6, 8]);
assertEquals(odd, [5, 7, 9]);