We are always writing, every day, tons of lines of code. We add new features and change existing ones. We fix bugs and, sometimes, we may create some bugs too.
You can avoid basic bugs by creating some automatic routines such as lint and test your app every push or pull request.
Let me show you a simple example of a bug easily catch by a lint workflow.
You have to implement a new feature on your app that changes a function calculation using parameters.

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