How to convert simple array into two-dimensional array (matrix) with Javascript

Question

Imagine I have an array:

A = Array(1, 2, 3, 4, 5, 6, 7, 8, 9);

And I want it to convert into 2-dimensional array (matrix of N x M), for ins

Answer 1

This code is generic no need to worry about size and array, works universally

  function TwoDimensional(arr, size) 
    {
      var res = []; 
      for(var i=0;i < arr.length;i = i+size)
      res.push(arr.slice(i,i+size));
      return res;
    }

1. Defining empty array.
2. Iterate according to the size so we will get specified chunk.That's why I am incrementing i with size, because size can be 2,3,4,5,6......
3. Here, first I am slicing from i to (i+size) and then I am pushing it to empty array res.
4. Return the two-dimensional array.