From: "Wolfgang Nádasi-Donner" <wonado@...>
Date: 2007-02-20T22:35:05+09:00
Subject: Re: get rid of last element in an array

Josselin schrieb:
> 
> if i have
> 
> my_list = "2-131-25-5558-247-68"
> 
> and I want to get rid of the last element...
> I wrote :
> 
> my_list.split('-') - my_list.split('-').last.to_a        =>  
> "22-13-25-58-47"
> 
> which runs well.. but isn't too complex....  ?
> 
> tfyl
> 
> joss
> 

irb(main):001:0> my_list = "2-131-25-5558-247-68"
=> "2-131-25-5558-247-68"
irb(main):002:0> my_list.split('-') - my_list.split('-').last.to_a
=> ["2", "131", "25", "5558", "247"]
irb(main):003:0> my_list.split('-')[0..-1].join('-')
=> "2-131-25-5558-247-68"
irb(main):004:0> my_list.split('-')[0..-2].join('-')
=> "2-131-25-5558-247"
irb(main):005:0> my_list.split('-')[0..-3].join('-')
=> "2-131-25-5558"
irb(main):006:0> my_list.sub(/(?:-\d+)$/, '')
=> "2-131-25-5558-247"
irb(main):007:0> my_list.sub(/(?:-\d+){2}$/, '')
=> "2-131-25-5558"
irb(main):008:0> my_list.sub(/(?:-\d+){3}$/, '')
=> "2-131-25"

Some ideas...

Wolfgang N�dasi-Donner