From: Joel Pearson <lists@...>
Date: 2013-03-30T01:38:54+09:00
Subject: Re: Ruby Typing?

Sometimes it's best to let the errors occur, there's already a certain 
amount of error-handling in Ruby.

Anyway, this should do what you want:

def Add_two_numbers(x,y)
[x,y].each { |num|
fail ArgumentError, "#{num} is not a number" unless num.is_a? Fixnum
}
x + y
end

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