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snippets/js/s/initialize2-d-array.md

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+---
+title: Initialize 2D array
+type: snippet
+language: javascript
+tags: [array]
+cover: cloudy-rock-formation
+dateModified: 2020-10-20T23:02:01+03:00
+---
+
+Initializes a 2D array of given width and height and value.
+
+- Use `Array.from()` and `Array.prototype.map()` to generate `h` rows where each is a new array of size `w`.
+- Use `Array.prototype.fill()` to initialize all items with value `val`.
+- Omit the last argument, `val`, to use a default value of `null`.
+
+```js
+const initialize2DArray = (w, h, val = null) =>
+  Array.from({ length: h }).map(() => Array.from({ length: w }).fill(val));
+```
+
+```js
+initialize2DArray(2, 2, 0); // [[0, 0], [0, 0]]
+```