[Pharo-users] how to write this without a if then

Hello, Yesterday I had a talk with luc frabresse about using if then. He said if I understand it right, Its the best to not using a if then or a ifTrue/ifFalse. Can anyone help me figure out how to rewrite this project so I will not use the ifTrue in the basement function. my code so far can be found here : https://github.com/RoelofWobben/AOC2015 Roelof