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instance method
Set::SubclassCompatible#keep_if
keep_if(&block)
lib/set/subclass_compatible.rb
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# File tmp/rubies/ruby-4.1.0-preview1/lib/set/subclass_compatible.rb, line 198
def keep_if(&block)
block_given? or return enum_for(__method__) { size }
reject(&block).each { |o| delete(o) }
self
end
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