From: javier ramirez <jramirez@...>
Date: 2006-09-14T10:20:43+09:00
Subject: Re: Question about 'unless' (negated if)

both system calls will be always invoked. The statement under "unless" 
scope is ftp.get(str), which will be always invoked unless 
str.index('d') == 0

you can use unless in two ways (shown below). The first one is a 
one-liner and it goes immediately after the conditioned statement. The 
second one marks the beginning of the conditioned block. The first one 
should ring a bell with perl developers and the second  with 
C/Java/Javascript ones

whatever unless condition

unless condition
    whatever
    and_so_on
end

regards,

javier

Lincoln Anderson wrote:
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> Using this snippet:
>
>     dir.each { |str|
>         ftp.get(str) unless str.index('d') == 0
>         system("mkdir " + lpath + str.split('/').index(str.length-1))
>         system("cd " + lpath + str.split('/').index(str.length-1))
>         }
>
>
> Will system be called both times all the time, or will the first one
> be called only when the unless condition is satisfied, or will both
> calls only be enacted when the unless condition is satisfied?  I've
> seen examples that used else statements with unless calls, but I'm not
> sure if this is needed here or not.  Unless is new to me :)
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