Method: Weak::Set#&

Defined in:
lib/weak/set.rb

#&(enum) ⇒ Weak::Set Also known as: intersection

Note:

Weak::Set does not test member equality with == or eql?. Instead, it always checks strict object equality, so that, e.g., different strings are not considered equal, even if they may contain the same string content.

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

Examples:

Weak::Set[1, 3, 5] & Weak::Set[3, 2, 1]    # => Weak::Set[1, 3]
Weak::Set[1, 2, 9] & [2, 1, 3]             # => Weak::Set[1, 2]

Parameters:

Returns:

  • a new weak set containing elements common to self and the given enumerable object.



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# File 'lib/weak/set.rb', line 293

def &(enum)
  new_set = self.class.new
  do_with_enum(enum) do |obj|
    new_set.add(obj) if include?(obj)
  end
  new_set
end