From: Rudolf Polzer <AntiATField_adsgohere@...>
Date: 2003-01-01T19:05:11+09:00
Subject: Re: clear understanding of |=

Scripsit ille aut illa TAKAHASHI Masayoshi <maki@rubycolor.org>:
[...]
> class Foo
>   def initialize
>     @bar = 1
>   end
>   def bar=(x)
>     p "bar= called"
>     @bar = x
>   end
>   def bar
>     p "bar called"
>     @bar
>   end
> end
[...]
> ex.1  foo.bar ||= 1
> "bar called"

(and if foo.@bar was false, bar= would also have been called)

> ex.2  foo.bar = foo.bar || 1
> "bar called"
> "bar= called"
> 
> ex.3  foo.bar = foo.bar ? foo.bar : 1
> "bar called"
> "bar called"
> "bar= called"

(and if foo.@bar was false, foo.bar would only have been called once)


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