From: Wouter de Bie <ruby@...>
Date: 2006-06-26T03:27:35+09:00
Subject: Odd << behaviour

Consider the following code:

class Stuff
   def << (arg1,arg2)
      puts arg1
      puts arg2
   end
end


s = Stuff.new


When doing the following:

s << "1", "2"

Ruby errors with:

stuff:8: parse error, unexpected ',', expecting ')'

When doing:

s << "1"

Ruby expects 2 arguments instead of one (which is right).

But when doing:

s.<< "1", "2"

suddenly everything works. To me, this seems a bit weird, since I 
expected that s << is syntactic sugar for s.<<, but the implementation 
seems different. Also using <<(*args) in the method definition doesn't 
do what I expect it to do. Of course I can work around not using s << 
with multiple arguments, but I'm just curious what the design principles 
are behind this behaviour.

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