method

select!

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select!(&block) public

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

# File lib/set.rb, line 420
  def select!(&block)
    block or return enum_for(__method__) { size }
    n = size
    keep_if(&block)
    self if size != n
  end

select!

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