Set#keep_if

() { (A) -> untyped } -> self

keep_if(&block)

# File tmp/rubies/ruby-3.4.1/lib/set.rb, line 557
def keep_if(&block)
  block_given? or return enum_for(__method__) { size }
  # Instead of directly using @hash.keep_if, perform enumeration
  # using self.each that subclasses may override.
  reject(&block).each { |o| @hash.delete(o) }
  self
end

Deletes every element of the set for which block evaluates to false, and returns self. Returns an enumerator if no block is given.

See also #join #length #intersection #map! also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0

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