dickson

It's not the amount of knowledge that makes a programmer competent. It's whether this person has the potential to be great by having the drive for constant self improvement. A great programmer is someone who pays close attention to her work and always asks whether it can be even better.

vimdiff is a mode within vim to compare differences between buffers. It allows side-by-side comparisons like modern GUI diff tools by showing buffers in different 'windows' (vim screen splitting). You could also open multiple window in this mode to make vimdiff behave like a 3-way merge tool. It also has commands to pick hunks from different buffers into the merge buffer.

Tail recursion optimization, lazy evaluation

They both did it yo