I don't try to convince you to like Ruby, but I don't really understand how you can know in other languages if something comes from a plugin or not by simply lo

I don't try to convince you to like Ruby, but I don't really understand how you can know in other languages if something comes from a plugin or not by simply looking at it and not knowing the std library or using an IDE. Maybe in the case of a language with a very small standard library, this could be easy: as the best assumption could be that it is in a plugin/module. But I think looking at a piece of code and direct knowing from _which_ plugin some methods comes from has more to do with naming conventions than with the language itself, especially in languages where either overriding or overloading or a form of them is possible. In the case of Ruby, I recommend RubyMine and just to go to definition. 99% of cases it will correctly open the definition from the gem of std library. I agree that in Ruby - maybe more than in other languages - one can really make some behaviors hard to discover. But most of the libraries are straight forward and Rails is very well documented in code. I usually prefer to just go to the definition and read the method than browse the API docs.