Q151. What is the purpose of unmountComponentAtNode method?
This method is available from react-dom package and it removes a mounted React component from the DOM and clean up its event handlers and state. If no component was mount...
Technical Question Bank · Peer-Reviewed
Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (154 available).
Active:
Tag: state ×
Q152. How do you say that state updates are merged?
When you call setState() in the component, React merges the object you provide into the current state. For example, let us take a facebook user with posts and comments de...
Q153. How to create react class components without ES6?
If you don’t use ES6 then you may need to use the create-react-class module instead. For default props, you need to define getDefaultProps() as a function on the passed o...
Q154. What is state mutation and how to prevent it?
`State mutation` happens when you try to update the state of a component without actually using `setState` function. This can happen when you are trying to do some comput...