Rename js snippets

snippets/js/s/offset-array-elements.md

@@ -0,0 +1,23 @@
+---
+title: Offset array elements
+type: snippet
+language: javascript
+tags: [array]
+cover: interior-10
+dateModified: 2020-10-21T21:54:53+03:00
+---
+
+Moves the specified amount of elements to the end of the array.
+
+- Use `Array.prototype.slice()` twice to get the elements after the specified index and the elements before that.
+- Use the spread operator (`...`) to combine the two into one array.
+- If `offset` is negative, the elements will be moved from end to start.
+
+```js
+const offset = (arr, offset) => [...arr.slice(offset), ...arr.slice(0, offset)];
+```
+
+```js
+offset([1, 2, 3, 4, 5], 2); // [3, 4, 5, 1, 2]
+offset([1, 2, 3, 4, 5], -2); // [4, 5, 1, 2, 3]
+```