@tc39-proposal/group-by

Install

Install @tc39-proposal/group-by by pnpm

``bash
pnpm add @tc39-proposal/group-by
`

Usage

$3

`ts
import { groupBy } from "@tc39-proposal/group-by";

const array = [1, 2, 3, 4, 5];

// groupBy(array, fn) groups items by arbitrary key.
// In this case, we're grouping by even/odd keys
const result1 = groupBy(array, (num, index) => {
return num % 2 === 0 ? "even" : "odd";
});
console.info(result1);
// => { odd: [1, 3, 5], even: [2, 4] }
`

you can also use

`ts
import { groupByObject } from "@tc39-proposal/group-by";
`

$3

`ts
import { groupBy } from "@tc39-proposal/group-by";

// groupBy(array, fn, true) returns items in a Map, and is useful for grouping
// using an object key.
const odd = { odd: true };
const even = { even: true };
const result2 = groupBy(
array,
(num, index) => {
return num % 2 === 0 ? even : odd;
},
true
);
console.info(result2);
// => Map(2) { { odd: true } => [ 1, 3, 5 ], { even: true } => [ 2, 4 ] }
`

you can also use

`ts
import { groupByMap } from "@tc39-proposal/group-by";
``

Others

Welcome to contribute and make @tc39-proposal/group-by better!