What are the rules of hooks?
Hooks must be called at the top level of a component, not inside loops, conditions, or nested functions. And they only work in functional components or custom hooks. These rules exist because React relies on the order of hook calls.
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More FAQs in What Are React Hooks and Why They Changed React Forever
Hooks are functions that let functional components use state and other React features that previously required class components. useState, useEffect, useRef, and useContext are the most common hooks.
To solve problems with class components: lifecycle methods split related logic across methods, this was confusing, reusable stateful logic was hard to share, and classes were hard to optimize. Hooks addressed all of these with simpler, composable functions.
They replaced the need to write class components for state and lifecycle behavior. Before hooks, only class components could hold state. Hooks gave functional components the same power with less boilerplate.
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