29 lines
660 B
Markdown
29 lines
660 B
Markdown
---
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title: Shuffle array
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type: snippet
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language: javascript
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tags: [array,random,algorithm]
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cover: interior-11
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dateModified: 2021-02-20T21:17:38+02:00
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---
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Randomizes the order of the values of an array, returning a new array.
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- Use the [Fisher-Yates algorithm](https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle#Fisher_and_Yates'_original_method) to reorder the elements of the array.
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```js
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const shuffle = ([...arr]) => {
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let m = arr.length;
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while (m) {
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const i = Math.floor(Math.random() * m--);
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[arr[m], arr[i]] = [arr[i], arr[m]];
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}
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return arr;
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};
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```
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```js
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const foo = [1, 2, 3];
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shuffle(foo); // [2, 3, 1], foo = [1, 2, 3]
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```
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