From: rejoc <rejoc@...>
Date: 2006-07-27T17:45:04+09:00
Subject: Re: ||= in an expression

Farrel Lifson a �crit :
> On 27/07/06, rejoc <rejoc@freefree.fr> wrote:
> 
> In Ruby
> 
> nil || anObject
> 
> will return anObject and
> 
> anotherObject || anObject
> 
> will return anotherObject (assuming it's value isn't nil)
> 
> The expression
> 
> a[:i] ||= "a string"
> 
> is equivalent to
> 
> a[:i] = a[:i] || "a string"
> 
> (sort of like 'num+= 1' is the same as 'num = num + 1')If a[:i] is not
> nil then it will remain unchanged. If it is nil then it will be set to
> "a string".
> 
> Farrel
> 
Thanks a lot.