From: brabuhr@...
Date: 2007-04-29T01:55:16+09:00
Subject: Re: code block which allows dynamical numbers of arguments

On 4/28/07, anansi <kazaam@oleco.net> wrote:
> let's pretend I have a codeblock like this:
>
> #begin
> test = lambda {|c,d| @check = c if object.status == d}
> test.call("GoodBoy",12)
> #end
>
> So you see if object.status is 12 @check will be set to "Goodboy".
>
> But how can I make the block test to allow more than 2 arguments and
> that any further argument will be takes as further conditional statement?
>
> Like:
>
> test = lambda {|c,d,e| @check = c if object.status == d or object.status
> == e}
> test.call("GoodBoy",24,11)
>
> This should just happen automatically so I wanna call test sometimes
> with 2, but sometimes also with more arguments and it shall be extended
> as shown above.
>
> Is there any way in ruby to do so?

test = lambda {|c,d| @check = c if 12 == d}=> #<Proc:0xb7df9528@(irb):14>
test.call("GoodBoy",11)
=> nil
test.call("GoodBoy",12)
=> "GoodBoy"

test = lambda {|*args| @check = args[0] if 12 == args[1]}
=> #<Proc:0xb7ddb820@(irb):21>
test.call("GoodBoy",11)
=> nil
test.call("GoodBoy",12)
=> "GoodBoy"

test = lambda {|*args| @check = args[0] if args[1..-1].include? 12}
=> #<Proc:0xb7db8154@(irb):28>
test.call("GoodBoy",11)
=> nil
test.call("GoodBoy",11,13)
=> nil
test.call("GoodBoy",11,13,12)
=> "GoodBoy"