Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →
instance method
Set#filter!
filter!(&block)
lib/set.rb
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# File tmp/rubies/ruby-3.3.0/lib/set.rb, line 583
def select!(&block)
block_given? or return enum_for(__method__) { size }
n = size
keep_if(&block)
self if size != n
end
Alias of #select!
Equivalent to Set#select!