NADSOFT Interview Questions, Process, and Tips

Q1. Explain promises and callback functions with example
Ans. 
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 re...read more
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Q2. What is middleware
Ans. 
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.
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Find the second largest elements in an array

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Q1. What is event loop
Ans. 
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.
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Q1. Tell me about yourself?
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Q2. What is your skills?
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Q1. Tell me about selenium
Ans. 
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.
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Q2. Expalin java inheritance ana polymorphism
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Q3. WHich tool you have used
Ans. 
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
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Q1. Introduce yourself
Ans. 
I am a Node JS Developer with 5 years of experience in building scalable and efficient web applications.
• 5 years of experience in Node JS development

• Proficient in building scalable and efficient web applications

• Strong understanding of backend development principles
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Q2. Explain Eventloop
Ans. 
Eventloop is a mechanism in Node.js that allows non-blocking I/O operations to be performed asynchronously.
• Eventloop is responsible for handling asynchronous operations in Node.js.

• It allows Node.js to perform I/O operations without blocking the execution of other code.

• Eventloop continuously checks the event queue for any pending events and executes them in a loop.

• Callbacks are used to handle the completion of asynchron
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Q1. It was more technical DSA question
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Q1. More technical questions about array function
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Q1. Tell me about you
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