From: Jeppe Jakobsen <jeppe88@...>
Date: 2006-02-13T05:21:34+09:00
Subject: Implanting a new method for a class

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Hi there, I have a question regarding how to implant a new method into the
class Array. I would like to write a ruby file that sums all of the digits
in an array. I have tried  this:

class Array
    def Array.sum
        until (Array.empty?)
            arraySum +=3D Array.pop
        end
        puts arraySum
    end
end

Gave no error when I ran the code. My problem occur when i try to use this
method:

require "Library/Array_sum.rb"
a =3D [1..100]
a.sum

I get a NoMethodError on sum. Can anybody tell me what I did wrong here?
Thanks in advance :)

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