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Chapter 17. Smells and Heuristics > Functions
Functions
F1: Too Many Arguments
Functions should have a small number of arguments. No argument is best, followed by one, two, and three. More than three is very questionable and should be avoided with prejudice. (See “Function Arguments” on page 40.)
F2: Output Arguments
Output arguments are counterintuitive. Readers expect arguments to be inputs, not outputs. If your function must change the state of something, have it change the state of the object it is called on. (See “Output Arguments” on page 45.)
