use callback vs use memo
// They both take a function and an array of dependencies:
useCallback(() => {···}, [dependency1, dependency2]);
useMemo(() => {···}, [dependency1, dependency2]);
// So what is the difference?
// useCallback returns its function uncalled so you can call it later
// therefore, it gives you back the function's reference
// useMemo calls its function and returns the result.
// therefore, it gives you back the function's return value
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