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		mercurial on May 7, 2014 \| parent \| context \| favorite \| on: I don't love the single responsibility principle Maybe I'm not interested in testing what the function does? But yes, for pure functions, it's kind of a weak argument. More generally, you can't really swap a different implementation in place.

JackMorgan on May 7, 2014 [–]

I answered this in my other answer to you: https://news.ycombinator.com/item?id=7709395

It's a common misconception that interfaces are the only way to do polymorphism, because that's usually the only way in Java.

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