From: John Merlino <stoicism1@...>
Date: 2010-01-18T22:27:27+09:00
Subject: Re: What does ||= represent in this situation?

anler hp wrote:
> hello, the operator | | = is the same as the typical + =, -= and so
> on, why did exist in ruby and not in other languages is because in
> ruby any expression returns a value.
> here is an example very closed but pretty much less effective in other
> language
> 
> a = false;
> a || a = c;
> 
> this means, makes a = c only if a is false�, same things happen with
> 
> a ||= c  -- equivalent to --> a = a || c (if a is false, the right
> side of the || will be evaluated and its value will be returned -this
> only happen in ruby-, so c is returned either true or false)
> 
> sorry for my english

So if a is true, it is returned. If a is false, c is returned. What if a 
is undefined?
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