deno.land / std@0.166.0 / collections / first_not_nullish_of.ts

first_not_nullish_of.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Applies the given selector to elements in the given array until a value is produced that is neither `null` nor `undefined` and returns that value * Returns `undefined` if no such value is produced * * Example: * * ```ts * import { firstNotNullishOf } from "https://deno.land/std@$STD_VERSION/collections/first_not_nullish_of.ts"; * import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts"; * * const tables = [ * { number: 11, order: null }, * { number: 12, order: 'Soup' }, * { number: 13, order: 'Salad' }, * ] * const nextOrder = firstNotNullishOf(tables, it => it.order) * * assertEquals(nextOrder, 'Soup') * ``` */export function firstNotNullishOf<T, O>( array: readonly T[], selector: (item: T) => O | undefined | null,): NonNullable<O> | undefined { for (const current of array) { const selected = selector(current);
if (selected !== null && selected !== undefined) { return selected as NonNullable<O>; } }
return undefined;}
std
Deno standard library
GitHub Repositorydenoland/deno_std
GitHub Stars
2458

Version Info

Tagged at
2 months ago