I am glad that I am old enough to have used the componentWillReceiveProps and young enough to be using useEffect.

I'm glad I'm old enough to have used:

   LD A, 100
   LD H, 130
   JP (HL)

and useEffect() ;)

Damn, I am feeling very old.

It's nice when you can navigate older/legacy codebases with ease! I learned ES6 first before having to use ES5, so that definitely got confusing at times.