Nesma & Partners Interview Questions and Answers

The useEffect Hook in React Native is used to perform side effects in functional components. It is similar to lifecycle methods in class components.

• useEffect Hook is used to handle side effects in functional components.

• It is called after the component has rendered and can be used to fetch data, subscribe to events, or update the DOM.

• It takes two arguments: a function that contains the side effect logic, and an optional array of dependencies.

• The function passed to useEffect is...read more

The best practice for calling APIs is to use asynchronous requests and handle errors properly.

• Use asynchronous requests to prevent blocking the UI thread.

• Handle errors properly by checking for response status codes and handling network failures.

• Implement caching mechanisms to improve performance and reduce unnecessary API calls.

• Consider using libraries or frameworks like Axios or Fetch for making API requests.

• Follow RESTful principles and use appropriate HTTP methods for diff...read more

Redux Thunk and Redux Saga are middleware libraries for Redux that allow for asynchronous actions.

• Redux Thunk is a simple middleware that allows for asynchronous actions by returning a function instead of an action object.

• Redux Saga is a more powerful middleware that uses generator functions to handle asynchronous actions and allows for more complex control flow.

• Both libraries are commonly used in React Native applications to manage state and handle asynchronous actions.

• Redux...read more

My highest priority HOC components are those that handle authentication and authorization.

• Authentication HOCs like withAuthenticator and withAuthContext

• Authorization HOCs like withAuthorization and withRoleBasedAccessControl

• HOCs that handle user sessions and persistent login state

React Native bridge is a communication layer between JavaScript code and native code.

• It allows React Native to interact with native modules written in Objective-C, Java, or Swift.

• The bridge sends messages between the two environments, allowing for seamless integration.

• The bridge can also be used to pass data between the two environments.

• For example, a React Native app might use the bridge to access the device's camera or accelerometer.

• The bridge can be a performance bottlenec...read more

HOC is a function that takes a component and returns a new component with additional functionality.

• HOC is a design pattern in React.

• It allows reusing component logic.

• HOC can be used for cross-cutting concerns like authentication, logging, etc.

• HOC can be created using a function that takes a component and returns a new component.

• The new component can render the original component with additional props or wrap it with other components.

• Example: WithAuth HOC can add authenticatio...read more

Props are short for properties and are used to pass data from one component to another in React Native.

• Props are read-only and cannot be modified by the child component.

• Props are passed down from parent to child component.

• Props can be any data type, including strings, numbers, objects, and functions.

• Props are accessed using the 'this.props' syntax in class components and 'props' in functional components.

• Props can have default values set using defaultProps.