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I would controversially add, - don't use interfaces until you absolutely have to, and then try and find another way. YMMV, but in my corporate experience with

I would controversially add, - don't use interfaces until you absolutely have to, and then try and find another way. YMMV, but in my corporate experience with OO code, I find a lot of interfaces that have one implementation. It's a waste to plan for a future that doesn't come. I feel we're lacking something like software mindfulness. Where you stay in the moment and just solve the problem.

jolux 6y ago
It depends what language you’re in. As long as you can use fakes, it doesn’t matter if you use interfaces or not. In C#, implementations are sealed by default so faking them is not feasible unless you make the function virtual.