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javascript/snippets/shuffle.md

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+---
+title: Shuffle array
+type: snippet
+tags: [array,random,algorithm]
+cover: interior-11
+dateModified: 2021-02-20T21:17:38+02:00
+---
+
+Randomizes the order of the values of an array, returning a new array.
+
+- 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.
+
+```js
+const shuffle = ([...arr]) => {
+  let m = arr.length;
+  while (m) {
+    const i = Math.floor(Math.random() * m--);
+    [arr[m], arr[i]] = [arr[i], arr[m]];
+  }
+  return arr;
+};
+```
+
+```js
+const foo = [1, 2, 3];
+shuffle(foo); // [2, 3, 1], foo = [1, 2, 3]
+```