code: function range(start, end, step) {
      start = +start || 0;
      step =  (+step || 1);
  
      if (end == null) {
        end = start;
        start = 0;
      }
      // use `Array(length)` so engines like Chakra and V8 avoid slower modes
      // http://youtu.be/XAqIpGU8ZZk#t=17m25s
      var index = -1,
          length = nativeMax(0, ceil((end - start) / step)),
          result = Array(length);
  
      while (++index < length) {
        result[index] = start;
        start += step;
      }
      return result;
    }
docs: Creates an array of numbers (positive and/or negative) progressing from
  `start` up to but not including `end`. If `start` is less than `stop` a
  zero-length range is created unless a negative `step` is specified.
  
  @static
  @memberOf _
  @category Arrays
  @param {number} [start=0] The start of the range.
  @param {number} end The end of the range.
  @param {number} [step=1] The value to increment or decrement by.
  @returns {Array} Returns a new range array.
  @example
  
  _.range(4);
  // => [0, 1, 2, 3]
  
  _.range(1, 5);
  // => [1, 2, 3, 4]
  
  _.range(0, 20, 5);
  // => [0, 5, 10, 15]
  
  _.range(0, -4, -1);
  // => [0, -1, -2, -3]
  
  _.range(1, 4, 0);
  // => [1, 1, 1]
  
  _.range(0);
  // => []