Go to Latest
File
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Returns a new array, containing all elements in the given array transformed using the given transformer, except the ones * that were transformed to `null` or `undefined` * * Example: * * ```ts * import { mapNotNullish } from "https://deno.land/std@$STD_VERSION/collections/mod.ts"; * import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts"; * * const people = [ * { middleName: null }, * { middleName: 'William' }, * { middleName: undefined }, * { middleName: 'Martha' }, * ] * const foundMiddleNames = mapNotNullish(people, it => it.middleName) * * assertEquals(foundMiddleNames, [ 'William', 'Martha' ]) * ``` */export function mapNotNullish<T, O>( array: readonly T[], transformer: (el: T) => O,): NonNullable<O>[] { const ret: NonNullable<O>[] = [];
for (const element of array) { const transformedElement = transformer(element);
if (transformedElement !== undefined && transformedElement !== null) { ret.push(transformedElement as NonNullable<O>); } }
return ret;}