From: Josselin <josselin@...>
Date: 2006-08-11T15:50:05+09:00
Subject: Re: good writing in Ruby...

On 2006-08-10 18:22:50 +0200, Robert Klemme <shortcutter@googlemail.com> said:

> On 10.08.2006 18:17, Josselin wrote:
>> I know I can write it the 'ugly common way' (loop)
>> but I'd like to see how it can be done the Ruby way ... (I am a newbie...)
>> 
>> here is an array
>> roles = [ "a", "b", "c", "d", "e" ]
>> 
>> Depending upon a variable 'user.role',
>> I would like to  suppress all elements in the array , less or equal to 
>> this variable
>> 
>> ex :
>> user.role = "a"    #=> roles = ["b", "c", "d", "e" ]            "a" deleted
>> user.role = "b"    #=> roles = ["c", "d", "e" ]           "a", "b"  deleted
>> user.role = "c"    #=> roles = [ "d", "e" ]               "a", "b", "c" deleted
>> user.role = "d"    #=> roles = [ "e" ]                    "a", "b", 
>> "c", "d"  deleted
>> user.role = "e"    #  do nothing
>> 
>> thanks for your tips
>> 
>> Joss
>> (I am on my way to buy the Ruby Recipes PDF Cookbook...)
>> 
> 
> Do you actually want to modify the array or do you just want to work 
> with the reduced set?  Does this help?
> 
>  >> roles = %w{a b c d e f}
> => ["a", "b", "c", "d", "e", "f"]
>  >> roles.select {|r| r >= "c"}
> => ["c", "d", "e", "f"]
>  >> roles.select {|r| r > "c"}
> => ["d", "e", "f"]
>  >> roles
> => ["a", "b", "c", "d", "e", "f"]
>  >> roles.delete_if {|r| r <= "c"}
> => ["d", "e", "f"]
>  >> roles
> => ["d", "e", "f"]
> 
> Kind regards
> 
> 	robert

thanks I'll look over it .. I'll check how it works with string values