Recursion: Good or bad? I mean, it's very few lines, efficient and pretty but can be so damn hard for others to read and debug.

@Lasse @h3ll and also very important: used properly and not like an idiot that writes shitty code. Which I think is the main issue when someone can't understand the code

Recursion is beautiful but you have to be careful especially when using it in a language that does not have built in tail recursion. Otherwise you can quite quickly overflow your stack and get lots of funny (i.e difficult to reproduce and debug) errors.

Like iteration it has good and bad points. The important thing to keep in mind is when to use it.
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