From: Martin DeMello <martindemello@...>
Date: 2005-05-12T05:20:28+09:00
Subject: Re: alternatives to ? : contruct

Joel VanderWerf <vjoel@path.berkeley.edu> wrote:
> 
> Just kidding:
> 
> class Object
>    def incase(cond)
>      if cond
>        self
>      else
>        yield
>      end
>    end
> end
> 
> a = 3.incase(1==2) {"c"}
> p a
> a = 3.incase(1==1) {"c"}
> p a

That's only lazy in its second argument :) Maybe

def only(&block)
  block
end

class Proc
  def if(arg)
    arg ? self.call : arg
  end
end

class Object
  def then
    self ? yield : self
  end

  def else
    self ? self : yield
  end

  alias :otherwise :else
end

p (1==1).then { 5 }.else { 1/0 }

p only {1/0}.if(1 == 2).otherwise { 4 }

martin