28 lines
666 B
Markdown
28 lines
666 B
Markdown
---
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title: Insert value at array index
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tags: array
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author: chalarangelo
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cover: messy-papers
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firstSeen: 2020-05-22T09:07:35+03:00
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lastUpdated: 2020-10-20T23:02:01+03:00
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---
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Mutates the original array to insert the given values after the specified index.
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- Use `Array.prototype.splice()` with an appropriate index and a delete count of `0`, spreading the given values to be inserted.
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```js
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const insertAt = (arr, i, ...v) => {
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arr.splice(i + 1, 0, ...v);
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return arr;
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};
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```
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```js
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let myArray = [1, 2, 3, 4];
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insertAt(myArray, 2, 5); // myArray = [1, 2, 3, 5, 4]
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let otherArray = [2, 10];
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insertAt(otherArray, 0, 4, 6, 8); // otherArray = [2, 4, 6, 8, 10]
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```
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