Most efficient way to create a zero filled JavaScript array?

Question

What is the most efficient way to create an arbitrary length zero filled array in JavaScript?

Answer 1

function makeArrayOf(value, length) {
  var arr = [], i = length;
  while (i--) {
    arr[i] = value;
  }
  return arr;
}

makeArrayOf(0, 5); // [0, 0, 0, 0, 0]

makeArrayOf('x', 3); // ['x', 'x', 'x']

Note that while is usually more efficient than for-in, forEach, etc.