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instance method
Set#delete_if
delete_if() { |o| ... }
lib/set.rb
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# File tmp/rubies/ruby-3.0.5/lib/set.rb, line 386
def delete_if
block_given? or return enum_for(__method__) { size }
# @hash.delete_if should be faster, but using it breaks the order
# of enumeration in subclasses.
select { |o| yield o }.each { |o| @hash.delete(o) }
self
end
Deletes every element of the set for which block evaluates to true, and returns self. Returns an enumerator if no block is given.