From: Jason Roelofs <jameskilton@...>
Date: 2010-09-11T03:49:49+09:00
Subject: Re: How to do foo.chomp!.rstrip!.downcase! ?

On Sep 10, 2010, at 1:29 PM, Jesús Gabriel y Galán wrote:

> On Fri, Sep 10, 2010 at 6:26 PM, Jason Roelofs <jameskilton@gmail.com> wrote:
>> On Sep 10, 2010, at 11:28 AM, ara.t.howard wrote:
>> 
>>> 
>>> 
>>> 
>>>> 
>>>> ...it seems like I should be able to do:
>>>> 
>>>> foo.chomp!.rstrip!.downcase!
>>>> 
>>> 
>>> you can.
>>> 
>>> %w( chomp! rstrip! downcase! ).each{|m| foo.send(m)}
>>> 
>>> -a
>>> 
>> 
>> So... what's wrong with:
>> 
>> foo = foo.chomp.rstrip.downcase
> 
> Each call creates a copy of the string, and are all discarded along
> with the original except the last one.
> 
> Jesus.
> 

I don't see any problem there, that's expected. Ruby has a GC, and those will get cleaned up appropriately.

The ! versions don't work chained, this version does. You shouldn't be worrying about the cost of creating 3 strings.

Jason