From: Brian Candler <B.Candler@...>
Date: 2003-05-29T17:35:05+09:00
Subject: Re: Array.extend versus instance.extend

Incidentally, you can make your class more general-purpose by using ===,
noting that klass1 === obj is true if obj.is_a?(klass1)

i.e.
    case obj
    when klass1
      # this is executed if klass1 === obj
    end

I'm not sure exactly what you'd call it (I seem to remember this naming
problem occured for Test::Unit as well), but you'd have something like:

module ArrayMisc
        def shift_until_match(caseitem)
                res = []
                loop do
                        break if caseitem === self.first
                        res << self.shift
                end
                res
        end
end

# Then you can do:

class Array; include ArrayMisc; end

a = [0,1,"two","three","four","five"]
b = a.shift_until_match(String)
p a,b
#>> ["two", "three", "four", "five"]   [0, 1]

b = a.shift_until_match(/^f/)
p a,b
#>> ["four", "five"]   ["two", "three"]

Regards,

Brian.