What is the this problem in class components?
Class components rely on the this keyword, which causes binding issues that beginners struggle with. Methods need to be bound to the instance, or this is undefined. Hooks removed this whole category of bugs.
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More FAQs in Class vs Functional Components in 2025: Should You Still Learn Both?
Yes, but with different depth. Learn functional components deeply because that is what you write. Learn class components enough to read them and answer interview questions about lifecycle methods, not to write them from scratch.
Because they are simpler, have no this binding issues, and let you extract reusable logic into custom hooks. They are how all new React code is written and what the React team and ecosystem recommend.
Because you will read them in legacy codebases and answer interview questions about them. More importantly, the lifecycle knowledge, mount, update, unmount, deepens your understanding of how React works and how it maps to useEffect.
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