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instance method
Set#select!
() { (A) -> untyped } -> self?
select!(&block)
lib/set.rb
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# File tmp/rubies/ruby-3.4.1/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
Equivalent to Set#keep_if, but returns nil if no changes were made. Returns an enumerator if no block is given.