Q381. How are error boundaries handled in React v15?
**⚠️ LEGACY:** This question is only relevant for historical context. React v15 is extremely outdated (released in 2016). React v15 provided very basic support for _error...
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Q382. What is the purpose of render method of `react-dom`?
This method is used to render a React element into the DOM in the supplied container and return a reference to the component. If the React element was previously rendered...
Q383. What will happen if you use `setState()` in constructor?
When you use `setState()`, then apart from assigning to the object state React also re-renders the component and all its children. You would get error like this: _Can onl...
Q384. Is it good to use `setState()` in `componentWillMount()` method?
**⚠️ DEPRECATED:** `componentWillMount()` has been removed in React 17+. This question is only relevant for legacy React applications. **Historical Context:** While it wa...
Q385. What will happen if you use props in initial state?
If the props on the component are changed without the component being refreshed, the new prop value will never be displayed because the constructor function will never up...
Q386. How you use decorators in React?
You can _decorate_ your _class_ components, which is the same as passing the component into a function. **Decorators** are flexible and readable way of modifying componen...
Q387. What is CRA and its benefits?
**⚠️ OUTDATED:** Create React App (CRA) is no longer actively maintained and is not recommended for new projects as of 2024+. **Modern Alternatives:** Use **Vite** (for S...
Q388. What is the lifecycle methods order in mounting?
The lifecycle methods are called in the following order when an instance of a component is being created and inserted into the DOM. 1. `constructor()` 2. `static getDeriv...
Q389. What are the lifecycle methods going to be deprecated in React v16?
**⚠️ FULLY DEPRECATED:** These lifecycle methods have been deprecated and removed from React 17+. The following lifecycle methods were deprecated due to unsafe coding pra...
Q390. What is the purpose of `getDerivedStateFromProps()` lifecycle method?
The new static `getDerivedStateFromProps()` lifecycle method is invoked after a component is instantiated as well as before it is re-rendered. It can return an object to ...