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std/collections/partition_entries.ts

The Deno Standard Library
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Returns a tuple of two records with the first one containing all entries of * the given record that match the given predicate and the second one containing * all that do not. * * @example * ```ts * import { partitionEntries } from "https://deno.land/std@$STD_VERSION/collections/partition_entries.ts"; * import { assertEquals } from "https://deno.land/std@$STD_VERSION/assert/assert_equals.ts"; * * const menu = { * "Salad": 11, * "Soup": 8, * "Pasta": 13, * } as const; * const myOptions = partitionEntries( * menu, * ([item, price]) => item !== "Pasta" && price < 10, * ); * * assertEquals( * myOptions, * [ * { "Soup": 8 }, * { "Salad": 11, "Pasta": 13 }, * ], * ); * ``` */export function partitionEntries<T>( record: Readonly<Record<string, T>>, predicate: (entry: [string, T]) => boolean,): [match: Record<string, T>, rest: Record<string, T>] { const match: Record<string, T> = {}; const rest: Record<string, T> = {}; const entries = Object.entries(record);
for (const [key, value] of entries) { if (predicate([key, value])) { match[key] = value; } else { rest[key] = value; } }
return [match, rest];}