method

&

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&(enum) public

Returns a new set containing elements common to the set and the given enumerable object.

# File lib/set.rb, line 297
  def &(enum)
    enum.is_a?(Enumerable) or raise ArgumentError, "value must be enumerable"
    n = self.class.new
    enum.each { |o| n.add(o) if include?(o) }
    n
  end

&

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