initializeNDArray javascript Code Snippet in 2025

Create a n-dimensional array with given value.

• Use recursion.
• Use Array.from(), Array.prototype.map() to generate rows where each is a new array initialized using initializeNDArray().

const initializeNDArray = (val, ...args) =>
  args.length === 0
    ? val
    : Array.from({ length: args[0] }).map(() =>
        initializeNDArray(val, ...args.slice(1))
      );

initializeNDArray(1, 3); // [1, 1, 1]
initializeNDArray(5, 2, 2, 2); // [[[5, 5], [5, 5]], [[5, 5], [5, 5]]]