Aerosea Travels Tours Interview Questions and Answers

Promises and callback functions are used in Node.js for handling asynchronous operations.

• Callback functions are functions passed as arguments to another function to be executed later.

• Promises are objects representing the eventual completion or failure of an asynchronous operation.

• Example of callback function: fs.readFile('file.txt', (err, data) => { if (err) throw err; console.log(data); });

• Example of promise: const readFile = new Promise((resolve, reject) => { fs.readFile('f...read more

Middleware is a function that has access to the request and response objects in Node.js, and can modify or terminate the request-response cycle.

• Middleware functions can perform tasks like logging, authentication, error handling, etc.

• They are executed sequentially in the order they are defined in the code.

• Example: Express.js uses middleware to handle requests before they reach the route handler.

Event loop is a mechanism in Node.js that allows asynchronous operations to be executed non-blocking.

• Event loop is responsible for handling asynchronous operations in Node.js.

• It allows Node.js to perform non-blocking I/O operations.

• Event loop continuously checks the event queue for new events to execute.

• Event loop helps in efficient handling of multiple concurrent operations in Node.js.

Selenium is a popular open-source automation testing tool used for web application testing.

• Selenium supports multiple programming languages such as Java, Python, C#, etc.

• It allows testers to write test scripts in a variety of formats like HTML, Java, C#, etc.

• Selenium can automate web browsers across different platforms like Windows, Mac, Linux, etc.

I have used various tools such as Microsoft Excel, Google Analytics, and Adobe Photoshop.

• Microsoft Excel for data analysis and reporting

• Google Analytics for website traffic analysis

• Adobe Photoshop for graphic design