useCallback equivalent in React class component

Question

I have a large code base in React class components and some are so complex, that I do not want to refactor them to React functional components. For one function, I need memoization, so my question is:

Is there an equivalent for React functional component's useCallback in React classic components?

Answer 1

I think you'd have to use something like static getDerivedStateFromProps() to listen on the changes in the variable, and maybe use shouldComponentUpdate() as a workaround/manual memoization. In getDerivedStateFromProps() you would call your function in case of changes in the variables you want, and In shouldComponentUpdate() you should return false if your logic doesn't match.