19 lines
471 B
Markdown
19 lines
471 B
Markdown
---
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title: initialize2DArray
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tags: array,intermediate
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---
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Initializes a 2D array of given width and height and value.
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- Use `Array.prototype.map()` to generate h rows where each is a new array of size w initialize with value.
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- If the value is not provided, default to `null`.
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```js
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const initialize2DArray = (w, h, val = null) =>
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Array.from({ length: h }).map(() => Array.from({ length: w }).fill(val));
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```
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```js
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initialize2DArray(2, 2, 0); // [[0,0], [0,0]]
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```
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