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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@$STD_VERSION/collections/filter_keys.ts"; * import { assertEquals } from "https://deno.land/std@$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;}