Cheers Interactive Interview Questions and Answers

Database queries are requests for data or information from a database using a specific query language.

• Queries are written in languages like SQL (Structured Query Language).

• Example: 'SELECT * FROM patients WHERE age > 30;' retrieves all patients older than 30.

• Queries can be used to insert, update, or delete data, e.g., 'INSERT INTO patients (name, age) VALUES ('John', 45);'.

• They can filter, sort, and aggregate d...read more

API testing evaluates the functionality, reliability, and performance of application programming interfaces.

• Verifies API endpoints for expected responses, e.g., GET /users should return a list of users.

• Checks authentication and authorization, ensuring only valid users can access certain endpoints.

• Tests error handling by sending invalid requests and verifying appropriate error messages are returned.

• Measures perform...read more

foreach executes a function on each array element, while map transforms each element and returns a new array.

• foreach does not return a new array; it simply executes a function for each element.

• map returns a new array containing the results of applying a function to each element.

• Example of foreach: [1, 2, 3].forEach(num => console.log(num)); // Logs 1, 2, 3

• Example of map: const doubled = [1, 2, 3].map(num => ...read more

Functional components are stateless and simpler, while class-based components can manage state and lifecycle methods.

• Functional components are JavaScript functions that return JSX.

• Class-based components are ES6 classes that extend React.Component.

• Functional components are easier to read and test.

• Class-based components can hold and manage local state.

• Example of a functional component: const MyComponent = () => &...read more

ReactJS is a popular JavaScript library for building user interfaces, known for its component-based architecture and performance.

• Component-Based Architecture: React allows developers to build encapsulated components that manage their own state, making code reusable and easier to maintain.

• Virtual DOM: React uses a virtual representation of the DOM, which optimizes rendering and improves performance by minimizing di...read more

Extrusion technology is a manufacturing process that involves forcing material through a die to create a specific shape or form.

• Extrusion is commonly used in the production of plastic products such as pipes, tubing, and sheets.

• The process involves heating the material to a specific temperature and then forcing it through a die using a screw or piston.

• Extrusion can also be used to create metal products such as rods...read more