Prologic Web Solutions Intern Interview Questions and Answers

React hooks are functions that let you use state and lifecycle features in functional components.

• useState: Allows you to add state to functional components. Example: const [count, setCount] = useState(0);

• useEffect: Lets you perform side effects in function components. Example: useEffect(() => { document.title = `Count: ${count}`; }, [count]);

• useContext: Provides a way to pass data through the component tree without ...read more

Supervised learning is a machine learning approach where a model is trained on labeled data to make predictions or classifications.

• Involves training a model on a dataset with input-output pairs.

• Common algorithms include linear regression, decision trees, and support vector machines.

• Used for tasks like spam detection (classifying emails) and image recognition (identifying objects in images).

• The model learns from the lab...read more

MSE, or Mean Squared Error, is a common metric used to measure the average squared difference between predicted and actual values.

• MSE is calculated as the average of the squares of the errors: MSE = (1/n) * Σ(actual - predicted)².

• A lower MSE indicates a better fit of the model to the data.

• For example, if actual values are [3, -0.5, 2] and predicted values are [2.5, 0.0, 2], MSE = (1/3) * ((3-2.5)² + (-0.5-0)² + (2-2)²)...read more

Developed a task management application using the MERN stack to streamline team collaboration and project tracking.

• Utilized MongoDB for database management, storing user tasks and project details.

• Implemented Express.js to create RESTful APIs for task CRUD operations.

• Used React.js for building a responsive user interface, allowing users to add, edit, and delete tasks seamlessly.

• Incorporated Node.js for server-side logic...read more

Managing routes in a MERN stack involves defining API endpoints and client-side routes for seamless navigation and data handling.

• Use Express.js for backend routing: Define routes in a separate file, e.g., 'routes/user.js'.

• Implement RESTful API conventions: Use GET, POST, PUT, DELETE methods for CRUD operations.

• Utilize React Router for client-side routing: Set up routes in 'App.js' using <BrowserRouter> and <Ro...read more