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• First rule of functions is that they are small.
• They are smaller than that.
• Lots of little well-named functions because they will save you and everyone time.
• Most of us don’t have to worry about efficiency of function calls.
• Making functions small save time.
• Classes hide in long functions.
• Functions do One Thing.
• They do it well, and do it only.
• If you can extract one function from another, you should.

Uncle Bob, Clean Code, Episode 3 – Functions