From: ts <decoux@...>
Date: 2001-09-24T22:13:25+09:00
Subject: [ruby-talk:21633] Re: C++ / Ruby questions again

>>>>> "B" == =?ISO-8859-1?Q?Bernhard Gl=FCck?= <jglueck@vol.at> writes:

B> What the h*** is "#arity" ? Is this a ruby method ? or something else

 Yes. 

  Proc#arity means the instance method arity
  Proc::new  means the class method new

 For example, in ruby

pigeon% cat b.rb
#!/usr/bin/ruby
class A
   def a(b, c)
   end
end

a = A.new
am = a.method(:a)
p am.arity
pigeon% 

pigeon% b.rb
2
pigeon% 

 See

  http://www.rubycentral.com/book/ref_c_method.html#arity


Guy Decoux