Rename js snippets

snippets/js/s/array-sample.md

@@ -0,0 +1,22 @@
+---
+title: Random element in array
+type: snippet
+language: javascript
+tags: [array,string,random]
+cover: paper-card
+dateModified: 2020-10-22T20:24:30+03:00
+---
+
+Gets a random element from an array.
+
+- Use `Math.random()` to generate a random number.
+- Multiply it by `Array.prototype.length` and round it off to the nearest whole number using `Math.floor()`.
+- This method also works with strings.
+
+```js
+const sample = arr => arr[Math.floor(Math.random() * arr.length)];
+```
+
+```js
+sample([3, 7, 9, 11]); // 9
+```