Hooks make it possible to use React's state and other features without needing to create a class. Hooks are state and lifecycle aspects in React that function components "hook onto." It is ineffective in a school context. Hooks are backward-compatible, meaning they don't add any new functionality. It also doesn't substitute for your knowledge of React concepts.
When Should You Use Hooks?
If you create a function component and later wish to add any state to it, you must first convert it to a class. However, you can now do so by incorporating a Hook into an existing function component.
Hooking Rules
Hooks are identical to JavaScript functions, but while utilizing them, you must obey these two rules. The hooks rule ensures that all of a component's stateful logic is visible in its source code. These are the rules:
1. Only use Hooks at the highest level.
Hooks aren't supposed to be called from loops, conditions, or nested functions. At all times, hooks should be utilized at the top level of React methods. When a component renders, this rule ensures that Hooks are called in the same order each time.
2. Hooks should only be called from React functions.
Hooks can't be called from JavaScript functions. Hooks can be called from React function components instead. Custom Hooks can also be used to call Hooks.
custom Hooks in React
Custom Hooks are a way to reuse stateful logic (such as setting up a subscription and remembering the current value), but each time you use one, all states and effects within it are completely isolated. What causes a custom Hook to become isolated? Each Hook call is given its own state.
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