Initialize 2D array
JavaScript, Array · Oct 20, 2020
Initializes a 2D array of given width and height and value.
- Use
Array.from()andArray.prototype.map()to generatehrows where each is a new array of sizew. - Use
Array.prototype.fill()to initialize all items with valueval. - Omit the last argument,
val, to use a default value ofnull.
const initialize2DArray = (w, h, val = null) =>
Array.from({ length: h }).map(() => Array.from({ length: w }).fill(val));initialize2DArray(2, 2, 0); // [[0, 0], [0, 0]]
