22 lines
473 B
Markdown
22 lines
473 B
Markdown
---
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title: Transpose matrix
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type: snippet
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tags: [array]
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author: chalarangelo
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cover: painters-desk
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dateModified: 2022-04-20T05:00:00-04:00
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---
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Transposes a two-dimensional array.
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- Use `Array.prototype.map()` to create the transpose of the given two-dimensional array.
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```js
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const transpose = arr => arr[0].map((col, i) => arr.map(row => row[i]));
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```
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```js
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transpose([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]);
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// [[1, 4, 7, 10], [2, 5, 8, 11], [3, 6, 9, 12]
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```
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