Skip to main content
Go to Latest
function distinctBy
import { distinctBy } from "https://deno.land/std@0.181.0/collections/distinct_by.ts";

Returns all elements in the given array that produce a distinct value using the given selector, preserving order by first occurrence.

Examples

Example 1

import { distinctBy } from "https://deno.land/std@0.181.0/collections/distinct_by.ts";
import { assertEquals } from "https://deno.land/std@0.181.0/testing/asserts.ts";

const names = ["Anna", "Kim", "Arnold", "Kate"];
const exampleNamesByFirstLetter = distinctBy(names, (it) => it.charAt(0));

assertEquals(exampleNamesByFirstLetter, ["Anna", "Kim"]);

Parameters

array: readonly T[]
selector: (el: T) => D