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@std/collections@0.215.0

latest
Works with
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It is unknown whether this package works with Browsers
It is unknown whether this package works with Deno
It is unknown whether this package works with Node.js
It is unknown whether this package works with Cloudflare Workers
It is unknown whether this package works with Bun
•JSR Score70%•
Downloads1/wk
•
Published2 years ago (0.215.0)
function mapValues
mapValues<T, O, K extends string>(
record: Readonly<Record<K, T>>,
transformer: (
value: T,
key: K
) => O
): Record<K, O>

Applies the given transformer to all values in the given record and returns a new record containing the resulting keys associated to the last value that produced them.

Examples

Example 1

import { mapValues } from "@std/collections/map_values";
import { assertEquals } from "@std/assert/assert_equals";

const usersById = {
  "a5ec": { name: "Mischa" },
  "de4f": { name: "Kim" },
};
const namesById = mapValues(usersById, (it) => it.name);

assertEquals(
  namesById,
  {
    "a5ec": "Mischa",
    "de4f": "Kim",
  },
);

Type Parameters

T
O
K extends string

Parameters

record: Readonly<Record<K, T>>
transformer: (
value: T,
key: K
) => O

Return Type

Record<K, O>
mapValues<T, O, K extends string>(
record: Readonly<Partial<Record<K, T>>>,
transformer: (
value: T,
key: K
) => O
): Partial<Record<K, O>>

Applies the given transformer to all values in the given record and returns a new record containing the resulting keys associated to the last value that produced them.

Examples

Example 1

import { mapValues } from "@std/collections/map_values";
import { assertEquals } from "@std/assert/assert_equals";

const usersById = {
  "a5ec": { name: "Mischa" },
  "de4f": { name: "Kim" },
};
const namesById = mapValues(usersById, (it) => it.name);

assertEquals(
  namesById,
  {
    "a5ec": "Mischa",
    "de4f": "Kim",
  },
);

Type Parameters

T
O
K extends string

Parameters

record: Readonly<Partial<Record<K, T>>>
transformer: (
value: T,
key: K
) => O

Return Type

Partial<Record<K, O>>

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Add Package

deno add jsr:@std/collections

Import symbol

import { mapValues } from "@std/collections";
or

Import directly with a jsr specifier

import { mapValues } from "jsr:@std/collections";