import { groupBy } from "https://deno.land/std@0.147.0/collections/mod.ts";
Applies the given selector to each element in the given array, returning a Record containing the results as keys and all values that produced that key as values.
Example:
import { groupBy } from "https://deno.land/std@0.147.0/collections/group_by.ts";
import { assertEquals } from "https://deno.land/std@0.147.0/testing/asserts.ts";
type Person = {
name: string;
};
const people: Person[] = [
{ name: 'Anna' },
{ name: 'Arnold' },
{ name: 'Kim' },
];
const peopleByFirstLetter = groupBy(people, it => it.name.charAt(0))
assertEquals(peopleByFirstLetter, {
'A': [ { name: 'Anna' }, { name: 'Arnold' } ],
'K': [ { name: 'Kim' } ],
})