From: CHubas <CHubas7@...>
Date: 2007-05-27T02:05:23+09:00
Subject: Re: Introducing the "it" keyword

> irb(main):001:0> def it_test(v)
> irb(main):002:1>   (v+1).instance_eval do
> irb(main):003:2*     return self if self < 10
> irb(main):004:2>   end
> irb(main):005:1>   "nothing"
> irb(main):006:1> end

You can extend it and let the method do the work for you

def do_if(var, cond)
  yield var if cond[var]
end

do_if(Person.new, proc{|person| person.name == 'John'}) do |person|
  puts person
end

but IMO that's not more efficient than allocating a temporal variable,
except maybe for the persistence of the variable. Perhaps it has
better uses.