module Quantifier
def any?
self.each { |x| return true if yield x }
false
end
def all?
self.each { |x| return false if not yield x }
true
end
end
list = [1, 2, 3, 4, 5]
list.extend(Quantifier)
flag1 = list.any? {|x| x > 5 } # false
flag2 = list.any? {|x| x >= 5 } # true
flag3 = list.all? {|x| x <= 10 } # true
flag4 = list.all? {|x| x % 2 == 0 } # false