Method: Set#select!

Defined in:
lib/set.rb

#select!(&block) ⇒ Object Also known as: filter!

Equivalent to Set#keep_if, but returns nil if no changes were made. Returns an enumerator if no block is given.

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# File 'lib/set.rb', line 586

def select!(&block)
  block_given? or return enum_for(__method__) { size }
  n = size
  keep_if(&block)
  self if size != n
end