24 lines
827 B
Markdown
24 lines
827 B
Markdown
---
|
|
title: zip
|
|
tags: array,intermediate
|
|
---
|
|
|
|
Creates an array of elements, grouped based on the position in the original arrays.
|
|
|
|
Use `Math.max.apply()` to get the longest array in the arguments.
|
|
Creates an array with that length as return value and use `Array.from()` with a map-function to create an array of grouped elements.
|
|
If lengths of the argument-arrays vary, `undefined` is used where no value could be found.
|
|
|
|
```js
|
|
const zip = (...arrays) => {
|
|
const maxLength = Math.max(...arrays.map(x => x.length));
|
|
return Array.from({ length: maxLength }).map((_, i) => {
|
|
return Array.from({ length: arrays.length }, (_, k) => arrays[k][i]);
|
|
});
|
|
};
|
|
```
|
|
|
|
```js
|
|
zip(['a', 'b'], [1, 2], [true, false]); // [['a', 1, true], ['b', 2, false]]
|
|
zip(['a'], [1, 2], [true, false]); // [['a', 1, true], [undefined, 2, false]]
|
|
``` |