Capgemini Reactjs Developer Interview Questions, Process, and Tips

Development dependencies are needed for development and testing, while regular dependencies are needed for the application to run.

• Development dependencies are used during the development process, such as testing frameworks or build tools.

• Regular dependencies are required for the application to function properly in production.

• Development dependencies are typically listed in the devDependencies section of package.json, w...read more

Symbols ^ and ~ in package.json represent version ranges for dependencies.

• The symbol ^ represents a range that allows minor version updates.

• The symbol ~ represents a range that allows only patch updates.

• For example, ^1.2.3 allows any version from 1.2.3 to <2.0.0, while ~1.2.3 allows any version from 1.2.3 to <1.3.0.

404 page can be handled in React routing by creating a Route component with a path of '*' at the end of all other routes.

• Create a Route component with a path of '*' at the end of all other routes in the Switch component.

• Inside the '*' Route component, render a custom 404 page component.

• Use the Switch component to ensure that only one Route is rendered at a time.

Component lifecycle in functional components involves useEffect hook for side effects.

• Functional components use useEffect hook to handle side effects like fetching data, subscribing to events, etc.

• useEffect hook can be used to mimic componentDidMount, componentDidUpdate, and componentWillUnmount lifecycle methods.

• useEffect hook takes a callback function as its first argument and an optional array of dependencies as its...read more

Redux data flow is a unidirectional flow of data in React applications using a centralized store.

• Actions are dispatched to the store

• Reducers update the state based on the action

• Components subscribe to the store to access the updated state