From: ara.t.howard@...
Date: 2006-08-25T23:46:41+09:00
Subject: Re: unless =~ vs. ! =~

On Fri, 25 Aug 2006, Marco Lazzeri wrote:

> Hi!
>
> Could someone please help me understanding why the next two lines of
> code are different?
>
>  next unless line =~ /=/
>
>  next if !line =~ /=/
>
>
> Thanks,
> Marco

harp:~ > cat a.rb
require 'yaml'

y "!'foobar'"             => (!'foobar')
y "!'foobar' =~ /barfoo/" => (!'foobar' =~ /barfoo/)
y "false =~ /barfoo/"     => (false =~ /barfoo/)
y "'foobar' !~ /barfoo/"  => ('foobar' !~ /barfoo/)


harp:~ > ruby a.rb
a.rb:3: warning: string literal in condition
a.rb:4: warning: string literal in condition

"!'foobar'": false
"!'foobar' =~ /barfoo/": false
false =~ /barfoo/: false
"'foobar' !~ /barfoo/": true


! binds more tightly that =~

-a
-- 
to foster inner awareness, introspection, and reasoning is more efficient than
meditation and prayer.
- h.h. the 14th dalai lama