#!/usr/bin/ruby

class Array
    def rest
	retval = self.clone
	retval.shift
	return retval
    end

    def foldLeft(function)
	if self.size == 1
	    return self.first
	else
	    return function.call(self.first, self.rest.foldLeft(function))
	end
    end

    def eachAfter(element, &block)
	self[((self.index(element) or -1) + 1)..-1].each { |x|
	    yield x
	}
    end

    def eachStartWith(element, &block)
	self[(self.index(element) or 0)..-1].each { |x|
	    yield x
	}
    end
end

class Fixnum
    def not_equal?(num)
	self != num
    end
end

class Set
    def include_any?(enum)
	enum.each { |e|
	    if self.include?(e)
		return true
	    end
	}
	return false
    end
end

class Hash
    def include_hash?(hash)
	hash.each { |k,v|
	    return false unless self[k] == v
	}
	return true
    end
end