From: Daniel Berger <Daniel.Berger@...>
Date: 2006-07-28T01:36:45+09:00
Subject: Re: String#chop slow?  REALLY slow?

Mat Schaffer wrote:
> I just did a quick benchmark to prove something to myself.  But I'd like 
> to get a sanity check from the people on the list.
> 
> Basically I want to drop what will be a trailing "\n" from input.  But 
> it appears that using String#[] and if statements is nearly 200 times 
> more efficient than chop.   Which just seems really weird, so here's the 
> benchmark.  Maybe I'm doing something wrong.
> 
> Does this seem right?  Anyone care to comment?

<snip>

As someone else pointed out, you'll probably want to use String#chop! for 
faster performance, since it uses the current object instead of creating a new one.

Also note that str[0..-2] is not quite the same as str.chop when "\r\n" is 
involved:

irb(main):001:0> str = "hello world\r\n"
=> "hello world\r\n"
irb(main):002:0> str[0..-2]
=> "hello world\r"
irb(main):003:0> str.chop
=> "hello world"

I wouldn't think the extra work of checking for "\r\n" would add that much 
overhead, though.

Regards,

Dan


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