/
filter_values.ts
43 lines (40 loc) · 1.02 KB
/
filter_values.ts
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// Copyright 2018-2023 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 value that does not match the given predicate.
*
* @example
* ```ts
* import { filterValues } from "https://deno.land/std@$STD_VERSION/collections/filter_values.ts";
* import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts";
*
* const people = {
* "Arnold": 37,
* "Sarah": 7,
* "Kim": 23,
* };
* const adults = filterValues(people, (it) => it >= 18);
*
* assertEquals(
* adults,
* {
* "Arnold": 37,
* "Kim": 23,
* },
* );
* ```
*/
export function filterValues<T>(
record: Readonly<Record<string, T>>,
predicate: (value: T) => boolean,
): Record<string, T> {
const ret: Record<string, T> = {};
const entries = Object.entries(record);
for (const [key, value] of entries) {
if (predicate(value)) {
ret[key] = value;
}
}
return ret;
}