Add subset and superset operator for Array : Array Extension « Array « Ruby

Add subset and superset operator for Array

class Array

  def subset?(other)
    self.each  do |x|
      if !(other.include? x)
        return false

  def superset?(other)


a = [1, 2, 3, 4]
b = [2, 3]
c = [2, 3, 4, 5]

flag1 = c.subset? a     # false
flag2 = b.subset? a     # true
flag3 = c.superset? b   # true


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