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design-patterns Magic Quiz

Test your knowledge of design-patterns by answering this quiz!
Question 1 of 1

You are building an application that records and publishes data from a snail race. When any of the snails move more than 1mm, it publishes the positions of all snails into a dashboard. Those who are following the race can log into the dashboard and make a prediction.

What sort of design pattern best describes this behavior?


  • Singleton
  • Observer
  • Decorator
  • Factory
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