From: Justin Collins <justincollins@...>
Date: 2013-02-23T06:23:35+09:00
Subject: Re: Not able to understand the difference between "||=" and "|=".

On 02/22/2013 01:08 PM, Xavier R. wrote:
> On the same road I tried to the "&&=" as below :
>
>>> a = []
> => []
>>> a &&= [4,1]
> => [4, 1]
>>> a &&= [42,111]
> => [42, 111]
>>>
>
> Couldn't reach to any summary. How does it work?
>

https://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Operators#1._Assignment

http://lesseverything.com/blog/archives/2008/12/16/guarded-assignment-in-ruby/