Convert a 1D array to 2D array [duplicate]

Answer 1

There are so many ways to do the same thing:

var m = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var n = [];
var i = 0;
for (l = m.length + 1; (i + 3) < l; i += 3) {
    n.push(m.slice(i, i + 3));
}
// n will be the new array with the subarrays

The above is just one.