code: function shuffleSelf(array, size) {
        var index = -1,
            length = array.length,
            lastIndex = length - 1;
  
        size = size === undefined$1 ? length : size;
        while (++index < size) {
          var rand = baseRandom(index, lastIndex),
              value = array[rand];
  
          array[rand] = array[index];
          array[index] = value;
        }
        array.length = size;
        return array;
      }
docs: A specialized version of `_.shuffle` which mutates and sets the size of `array`.
  
  @private
  @param {Array} array The array to shuffle.
  @param {number} [size=array.length] The size of `array`.
  @returns {Array} Returns `array`.