code: function range(start, end, step) {
        if (step && isIterateeCall(start, end, step)) {
          end = step = undefined;
        }
        start = +start || 0;
        step = step == null ? 1 : (+step || 0);
  
        if (end == null) {
          end = start;
          start = 0;
        } else {
          end = +end || 0;
        }
        // Use `Array(length)` so engines like Chakra and V8 avoid slower modes.
        // See https://youtu.be/XAqIpGU8ZZk#t=17m25s for more details.
        var index = -1,
            length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
            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 `end` is not specified it's
  set to `start` with `start` then set to `0`. If `end` is less than `start`
  a zero-length range is created unless a negative `step` is specified.
  
  @static
  @memberOf _
  @category Utility
  @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 the new array of numbers.
  @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);
  // => []