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std/collections/filter_keys.ts

Deno standard library
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Returns a new record with all entries of the given record except the ones that have a key that does not match the given predicate * * Example: * * ```ts * import { filterKeys } from "https://deno.land/std@$STD_VERSION/collections/mod.ts"; * import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts"; * * const menu = { * 'Salad': 11, * 'Soup': 8, * 'Pasta': 13, * } * const menuWithoutSalad = filterKeys(menu, it => it !== 'Salad') * * assertEquals(menuWithoutSalad, { * 'Soup': 8, * 'Pasta': 13, * }) * ``` */export function filterKeys<T>( record: Readonly<Record<string, T>>, predicate: (key: string) => boolean,): Record<string, T> { const ret: Record<string, T> = {}; const keys = Object.keys(record);
for (const key of keys) { if (predicate(key)) { ret[key] = record[key]; } }
return ret;}