24 lines
543 B
Markdown
24 lines
543 B
Markdown
---
|
|
title: insertAt
|
|
tags: array,intermediate
|
|
---
|
|
|
|
Mutates the original array to insert the given values after the specified index.
|
|
|
|
- Use `Array.prototype.splice()` with an appropriate index and a delete count of `0`, spreading the given values to be inserted.
|
|
|
|
```js
|
|
const insertAt = (arr, i, ...v) => {
|
|
arr.splice(i + 1, 0, ...v);
|
|
return arr;
|
|
};
|
|
```
|
|
|
|
```js
|
|
let myArray = [1, 2, 3, 4];
|
|
insertAt(myArray, 2, 5); // myArray = [1, 2, 3, 5, 4]
|
|
|
|
let otherArray = [2, 10];
|
|
insertAt(otherArray, 0, 4, 6, 8); // otherArray = [2, 4, 6, 8, 10]
|
|
```
|