The purpose of grouping code into modules is lowering the overall complexity of the solution. If done properly, it’s easier to reason about an application composed out of modules without being overwhelmed by details. One of the means that lead to this goal is assigning responsibilities. Each module gets one or more responsibilities from the set of responsibilities of the whole application and hides in itself the way the responsibility is fulfilled.
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A protein reinforces the blood–brain barrier, which becomes leaky with age.
Expected errors should not throw, raise, or panic. Instead, they should return an error result. This works differently in every language, but is often a Result type, a union of null and the success value, or an error code. This pattern pushes you toward handling the error, which you should if you want to make your software reliable.
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