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@std/collections@0.215.0

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It is unknown whether this package works with Node.js
It is unknown whether this package works with Deno
It is unknown whether this package works with Browsers
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 associateBy
associateBy<T>(
array: Iterable<T>,
selector: (el: T) => string
): Record<string, T>

Transforms the given array into a Record, extracting the key of each element using the given selector. If the selector produces the same key for multiple elements, the latest one will be used (overriding the ones before it).

Examples

Example 1

import { associateBy } from "@std/collections/associate_by";
import { assertEquals } from "@std/assert/assert_equals";

const users = [
  { id: "a2e", userName: "Anna" },
  { id: "5f8", userName: "Arnold" },
  { id: "d2c", userName: "Kim" },
];
const usersById = associateBy(users, (it) => it.id);

assertEquals(usersById, {
  "a2e": { id: "a2e", userName: "Anna" },
  "5f8": { id: "5f8", userName: "Arnold" },
  "d2c": { id: "d2c", userName: "Kim" },
});

Type Parameters

T

Parameters

array: Iterable<T>
selector: (el: T) => string

Return Type

Record<string, T>

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Add Package

deno add jsr:@std/collections

Import symbol

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

Import directly with a jsr specifier

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