useState Vs setState || React Hooks || functional Vs class component || ReactJS

Understanding react state being replaced with useState.

Code Links:-
useState:

setState:

[rutujagaikwad]

Nicely explained ! Thank you and keep uploading. :)

[RanaAli-hwsz]

Finally my confusion cleared about setState and useState thank you sir

[Dagibu]

It is clear the difference in the implementation thanks!, however I have a question, in which cases do you use class components and in which cases do you use functional componentes with useState?