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49 lines
1.2 KiB
TypeScript
49 lines
1.2 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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/**
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* Returns a new record with all entries of the given record except the ones
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* that do not match the given predicate.
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*
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* @typeParam T The type of the values in the input record.
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*
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* @param record The record to filter entries from.
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* @param predicate The function to test each entry for a condition.
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*
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* @returns A new record with all entries that match the given predicate.
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*
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* @example Basic usage
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* ```ts
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* import { filterEntries } from "@std/collections/filter-entries";
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* import { assertEquals } from "@std/assert/assert-equals";
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*
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* const menu = {
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* Salad: 11,
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* Soup: 8,
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* Pasta: 13,
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* };
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*
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* const myOptions = filterEntries(
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* menu,
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* ([item, price]) => item !== "Pasta" && price < 10,
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* );
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*
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* assertEquals(myOptions, { Soup: 8 });
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* ```
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*/
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export function filterEntries<T>(
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record: Readonly<Record<string, T>>,
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predicate: (entry: [string, T]) => boolean,
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): Record<string, T> {
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const result: Record<string, T> = {};
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const entries = Object.entries(record);
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for (const [key, value] of entries) {
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if (predicate([key, value])) {
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result[key] = value;
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}
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}
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return result;
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}
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