Extract array in place : Array Extension « Array « Ruby

Extract array in place

class Array
  def extract!
    ary = self.dup
    self.reject! { |x| yield x }
    ary - self

p a = ("a".."h").to_a
p a.extract! { |x| x < "e" && x != "b" }     # => ["a", "c", "d"]
p a                # => ["b", "e", "f", "g", "h"]


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