17 lines
589 B
Markdown
17 lines
589 B
Markdown
---
|
|
title: bifurcate
|
|
tags: array,intermediate
|
|
---
|
|
|
|
Splits values into two groups. If an element in `filter` is truthy, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.
|
|
|
|
Use `Array.prototype.reduce()` and `Array.prototype.push()` to add elements to groups, based on `filter`.
|
|
|
|
```js
|
|
const bifurcate = (arr, filter) =>
|
|
arr.reduce((acc, val, i) => (acc[filter[i] ? 0 : 1].push(val), acc), [[], []]);
|
|
```
|
|
|
|
```js
|
|
bifurcate(['beep', 'boop', 'foo', 'bar'], [true, true, false, true]); // [ ['beep', 'boop', 'bar'], ['foo'] ]
|
|
``` |