javascript range()

/**
 * Behaves just like the python range() built-in function.
 * Arguments:   [start,] stop[, step]
 *
 * @start   Number  start value
 * @stop    Number  stop value (excluded from result)
 * @step    Number  skip values by this step size
 *
 * Number.range() -> error: needs more arguments
 * Number.range(4) -> [0, 1, 2, 3]
 * Number.range(0) -> []
 * Number.range(0, 4) -> [0, 1, 2, 3]
 * Number.range(0, 4, 1) -> [0, 1, 2, 3]
 * Number.range(0, 4, -1) -> []
 * Number.range(4, 0, -1) -> [4, 3, 2, 1]
 * Number.range(0, 4, 5) -> [0]
 * Number.range(5, 0, 5) -> []
 *   Number.range(5, 4, 1) -> []
 * Number.range(0, 1, 0) -> error: step cannot be zero
 * Number.range(0.2, 4.0) -> [0, 1, 2, 3]
 */
function range() {
  var start, end, step;
  var array = [];

  switch(arguments.length){
    case 0:
      throw new Error('range() expected at least 1 argument, got 0 - must be specified as [start,] stop[, step]');
      return array;
    case 1:
      start = 0;
      end = Math.floor(arguments[0]) - 1;
      step = 1;
      break;
    case 2:
    case 3:
    default:
      start = Math.floor(arguments[0]);
      end = Math.floor(arguments[1]) - 1;
      var s = arguments[2];
      if (typeof s === 'undefined'){
        s = 1;
      }
      step = Math.floor(s) || (function(){ throw new Error('range() step argument must not be zero'); })();
      break;
   }

  if (step > 0){
    for (var i = start; i <= end; i += step){
      array.push(i);
    }
  } else if (step < 0) {
    step = -step;
    if (start > end){
      for (var i = start; i > end + 1; i -= step){
        array.push(i);
      }
    }
  }
  return array;
}

Reference :
Implementing a Pythonic range() function in JavaScript. « o.O