/
filter_entries.ts
41 lines (38 loc) · 1.03 KB
/
filter_entries.ts
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// Copyright 2018-2021 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 do not match the given predicate
*
* Example:
*
* ```ts
* import { filterEntries } 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,
* } as const;
* const myOptions = filterEntries(menu,
* ([ item, price ]) => item !== 'Pasta' && price < 10,
* )
*
* assertEquals(myOptions, {
* 'Soup': 8,
* })
* ```
*/
export function filterEntries<T>(
record: Readonly<Record<string, T>>,
predicate: (entry: [string, T]) => boolean,
): Record<string, T> {
const ret: Record<string, T> = {};
const entries = Object.entries(record);
for (const [key, value] of entries) {
if (predicate([key, value])) {
ret[key] = value;
}
}
return ret;
}