From: Dominik Honnef <dominikh@...>
Date: 2010-06-15T08:54:50+09:00
Subject: Re: shorthand

Roger Pack <rogerpack2005@gmail.com> writes:

> I read this once:
>
> Operator ||= can be shorthand for code like:
>  x = "(some fallback value)" unless respond_to? :x or x
>
> How would that look like exactly, in shorthand, any guesses?
> -r

Sure you don't mean ||= as a way of easily implementing basic
memoization?

Example:

class Foo
  def bar
    @bar ||= begin
               # do some calculations here
               1 + rand
             end
  end
end

f = Foo.new
f.bar # => 1.01853966346202
f.bar # => 1.01853966346202