[ShellfishMeme]

useCallback makes sure that you don't recreate a function you need in a component at every re-render but only when its dependencies change. It returns a function.

useMemo returns a value which is the result of calling the function it is given once the dependencies change.

So useCallback is basically useMemo called with a function that returns a function.

[repsilat]

> useCallback ... returns a function.

It returns something with the same type you gave it. If you give it a function it gives you a function back.

In typescript it's declared to take a function but in practice it doesn't check, and can be used to stabilize the identity of anything.

useMemo otoh _does_ only take functions.