From: Robert Klemme <shortcutter@...>
Date: 2006-08-11T01:25:07+09:00
Subject: Re: good writing in Ruby...

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