23 lines
664 B
Markdown
23 lines
664 B
Markdown
---
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title: Offset array elements
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tags: array
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cover: interior-10
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firstSeen: 2018-04-10T19:07:50+03:00
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lastUpdated: 2020-10-21T21:54:53+03:00
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---
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Moves the specified amount of elements to the end of the array.
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- Use `Array.prototype.slice()` twice to get the elements after the specified index and the elements before that.
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- Use the spread operator (`...`) to combine the two into one array.
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- If `offset` is negative, the elements will be moved from end to start.
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```js
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const offset = (arr, offset) => [...arr.slice(offset), ...arr.slice(0, offset)];
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```
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```js
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offset([1, 2, 3, 4, 5], 2); // [3, 4, 5, 1, 2]
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offset([1, 2, 3, 4, 5], -2); // [4, 5, 1, 2, 3]
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```
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