From: David Alan Black <dblack@...>
Date: 2002-04-01T14:08:21+09:00
Subject: Re: String#begins?(s)

Hello --

On Mon, 1 Apr 2002, Garance A Drosihn wrote:

> At 12:31 PM +0900 4/1/02, Yukihiro Matsumoto wrote:
> >Hi,
> >
> >In message "String#begins?(s)"
> >     on 02/04/01, Tim Sutherland <timsuth@ihug.co.nz> writes:
> >
> >|class String
> >|    def begins?(s)
> >|        self[0...(s.size)] == s
> >|    end
> >|end
>
> should this
>      return false if s.size > self.size
> before checking for '=='?

The original test will return false if that's the case.

irb(main):011:0> class String;def begin?(s);self[0...(s.size)] == s;end;end
nil
irb(main):012:0> "abc".begin?("abcd")
false


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav