code: function(a, b, retArr) {
              if (retArr) {
                  return [a, b, a + b];
              }
              return a + b;
          }
docs: Returns the sum of a and b
  @param {Number} a
  @param {Number} b
  @param {Boolean} retArr If set to true, the function will return an array
  @returns {Number|Array} Sum of a and b or an array that contains a, b and the sum of a and b.