こういうの欲しい

bind_tap.rb

module BindTap
  def btap(&block)
    self.instance_eval(&block)
    self
  end
end

Object.include BindTap

hash = {a: 1, b: 2, c: 3}

b = hash.dup.tap do |hash|
  hash.delete :a
  hash.delete :b
end

p hash #=> {:a=>1, :b=>2, :c=>3}
p b    #=> {:c=>3}

c = hash.dup.btap do
  delete :a
  delete :b
end

p hash #=> {:a=>1, :b=>2, :c=>3}
p c    #=> {:c=>3}