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What is maintainable code?

  • it is easy to understand and troubleshoot
  • it is easy to test
  • it is easy to refactor

What is hard-to-maintain code?

  • it has many dependencies, making it hard to understand and hard to test independently of the whole
  • it accesses data from and writes data to the global scope, which makes it hard to consistently set up the same state for testing
  • it has side-effects, which means that it cannot be instantiated easily/repeatably in a test
  • it exposes a large external surface and doesn't hide its implementation details, which makes it hard to refactor without breaking many other components that depend on that public interface


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