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WTF is the Single-Responsibility Principle?

I often talk about the single-responsibility principle in the articles I write. What does it really mean? (Spoiler: It's probably exactly what you think.)

The single-responsibility principle is somewhat self-explanatory. It means that, in programming, everything — e.g. a class, function, module, plugin — should do one thing.

Some benefits to this approach include:

Because the idea is for code to stay focused on one thing, I often describe this principle as a chunk of code should do one thing and do it well. I say that because I find an implication that by breaking up code into individual responsibilities, the resulting code should be better — more solid and stable, easier to read and understand — than it would have been if responsibilities were combined.

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