this practice of letting every function, or method, perform only one task is called keeping functions pure.
6 Simple Tips on How to Start Writing Clean Code
Alex Devero

Purity has nothing to do with the size or specialization of a function. You can write a pure function that does a lot of stuff, it just has to be side-effect free and return the same value given the the same inputs.

That said, thinking about functions in a mathematical (functional, pure) way tends to lead to smaller, more specialized (and composeable) functions.

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