And I think Ruby management has its negligence; it's weird that a so popular and mature language has so much lack of informations about its behaviour.
Java: http://stackoverflow.com/questions/11227809/why-is-processin...
Php: http://stackoverflow.com/questions/60174/how-can-i-prevent-s...
Javascript: http://stackoverflow.com/questions/111102/how-do-javascript-...
Ruby, Python, Javascript: unique-ish language features
Java: general comp-sci corner cases
C, C++: what does this obscure operator mean
Erlang, Haskell, Node: how to get started
Go: how to live without features that were intentionally not included
PHP: How to avoid the security pitfalls that the standard library encourages
Seems about right... (Though I'm surprised to see Node alongside Erlang and Haskell in terms of people not knowing where to start)