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Groups > comp.lang.ruby > #3656

Re: calling methods, beginner help

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Ronnie Aa wrote in post #995580:
> For extra clearness:
>
> My class Do_this and my class Do_that both have to use that method..
> They both use the same variable and both have to apply the same
> operations on that variable (amongst other things of course)..

One way to share common code is using a module, and including it into 
those classes where you need it.

module MyUsefulMethods
  def product
    @foo.inject { |x,y| x*y }
  end
end

class DoThis
  include MyUsefulMethods
  def initialize
    @foo = [1,2,3]
  end
end

class DoThat
  include MyUsefulMethods
  def initialize
    @foo = [4,5,6]
  end
end

p DoThis.new.product
p DoThat.new.product

Note that I'm using an instance variable (@foo) not a global variable 
($foo). Each instance of those classes has its own @foo.

-- 
Posted via http://www.ruby-forum.com/.

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calling methods, beginner help Ronnie Aa <liquid98@gmail.com> - 2011-04-28 12:06 -0500
  Re: calling methods, beginner help Markus Schirp <mbj@seonic.net> - 2011-04-28 12:14 -0500
  Re: calling methods, beginner help 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-28 12:23 -0500
  Re: calling methods, beginner help Ronnie Aa <liquid98@gmail.com> - 2011-04-28 12:44 -0500
    Re: calling methods, beginner help Markus Schirp <mbj@seonic.net> - 2011-04-28 13:03 -0500
    Re: calling methods, beginner help 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-28 13:03 -0500
    Re: calling methods, beginner help Brian Candler <b.candler@pobox.com> - 2011-04-28 15:29 -0500
  Re: calling methods, beginner help Ronnie Aa <liquid98@gmail.com> - 2011-04-28 13:40 -0500
  Re: calling methods, beginner help Ronnie Aa <liquid98@gmail.com> - 2011-04-28 16:05 -0500
    Re: calling methods, beginner help Brian Candler <b.candler@pobox.com> - 2011-04-29 03:02 -0500
      Re: calling methods, beginner help Ronnie Aa <liquid98@gmail.com> - 2011-04-29 04:27 -0500
        Re: calling methods, beginner help Brian Candler <b.candler@pobox.com> - 2011-04-29 13:19 -0500
        Re: calling methods, beginner help Stu <stu@rubyprogrammer.net> - 2011-04-29 15:24 -0500

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