Method: Set#keep_if

Defined in:
lib/set.rb

#keep_if(&block) ⇒ Object

Deletes every element of the set for which block evaluates to false, and returns self. Returns an enumerator if no block is given.



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# File 'lib/set.rb', line 557

def keep_if(&block)
  block_given? or return enum_for(__method__) { size }
  # Instead of directly using @hash.keep_if, perform enumeration
  # using self.each that subclasses may override.
  reject(&block).each { |o| @hash.delete(o) }
  self
end