In prefix notation, the operator comes before the arguments, so you can kind of imagine that the operator calls next() which is recursively called. In infix notation, the operator goes between the arguments, so you can imagine it simply as a parse tree. In postfix notation, the operator comes aft...

I tried to implement equal method that relays on equality of properties on inner objects. I would like to write compact check for equality that takes in account null value to avoid NullPointerException. Naive implementation is: if (this.prop == null && that.prop != null) return false; if ...

Measuring a pile of logs code-golf array-manipulation Introduction This is a log of length 5: ##### I want to pile a bunch of these logs on top of each other. How I do this is that I slide a new log onto the topmost one from the right, and stop sliding when their left or right ends align ...