8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
15 lines
431 B
Markdown
15 lines
431 B
Markdown
### initialize2DArray
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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. 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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