Abstract Method in Ruby

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How can I force a subclass to implement a method in Ruby. There doesn't seem to be an abstract keyword in Ruby, which is the approach I would take in Java. Is there another more Ruby-like way to enforce abstract?

abstract ruby
7 Answers

Because the question is (focus on) "How can I force a subclass to implement a method in Ruby", so i think we can use TDD :D, for example: rspec shared example

shared_examples "MUST implement abstract method" do |method_sym|
  it { is_expected.to respond_to(method_sym) }
end

describe Stack do
  it_behaves_like "MUST implement abstract method", :push
  it_behaves_like "MUST implement abstract method", :pop
end

Maybe Tests are better than Abstract :D , reference: http://morningcoffee.io/interfaces-in-ruby.html

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