Total 20 question (100 marks)
- 1. An altered component may be uniquely identified with the help of ref.
- 2. What is the default local host port that a React development server uses?
- 3. Invoked once, only on the client, after rendering occurs.
- 4. The state can be initialized when code is loaded or the state can be set on event changes.
- 5. What type of element will be rendered from the following code? function Hello() { return <h1>Hello reactjs</h1>; } ReactDOM.render(<Hello />, document.getElementById('root'));
- 6. React is mainly for building _____________.
- 7. What is the children prop?
- 8. Which input tag attribute should be set in a React reusable text input component, and is passed for
- 9. How do you access a function fetch() from a h1 element in JSX?
- 10. Which method in a React Component should you override to stop the component from updating?
- 11. React considers everything as _______.
- 12. What is the correct syntax to import a Component from React?
- 13. What is ReactJS?
- 14. What command is used to start the React local development server?
- 15. Components cannot refer to other components in their output.
- 16. Why should you avoid copying the values of props into a component's state?
- 17. Which component lifecycle method, prepopulate a form in a React form component?
- 18. Who is developed React.js?
- 19. How do you fix the syntax error that results from running this code? const person =(firstName, lastName) => { first:
- 20. If our elements are dynamic, react can keep track of the changes using keys.