From: Josh Cheek <josh.cheek@...>
Date: 2010-09-22T12:24:17+09:00
Subject: Re: comparing the first half of a string to the second half

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On Tue, Sep 21, 2010 at 3:41 PM, joe chesak <rubytalk@chesak.com> wrote:

> I want to be able to test a string, to see if the second half of the string
> is a duplicate of the first part of the string, and if so I just want the
> first half (or the second for that matter).  I am using  ruby-1.9.2.
>
> I can accomplish this with the following:
>
> str = 'Cyano The CatCyano The Cat'
>
> str = str[0..str.size/2-1] if str[0..str.size/2-1] == str[str.size/2..-1]
>  => "Cyano The Cat"
>
> Is there a better way?
>
> Joe
>

Instead of subtracting 1 from the right side of the range, you can just use
3 dots.

str   = 'Cyano The CatCyano The Cat'
half  = str.size / 2
first = str[0...half]
last  = str[half..-1]
str   = first if first == last
p str

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