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I've personally rarely even needed to useMemo, I just write a function that returns the JSX I need and { myFunction() } in the functional component's return (gi

• phailhaus 5y ago
  If you're using Typescript that can get a bit annoying, since you'll also need to pass in whatever props necessary for the function to handle the logic + type them. Makes it nice and easy to test in isolation though.
  • heyparkerj 5y ago
    Typically the function has access to whatever props or state it needs because it's in the scope of the component. It's not pure, but it's rare that I need to verbosely pass props into the function call and then accept them in myFunction. I don't typically test these functions in isolation as the component itself is pure and I test the output of the component as a whole instead.
    • phailhaus 5y ago
      Oh gotcha, I thought this was a function that was defined outside of the component.