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initialize2DArray javascript Code Snippet in 2022

arrayintermediate

Last Updated: 26 November 2022

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.
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]]

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