Infosys Node Js Backend Developer Interview Questions and Answers

Node.js is a runtime environment that allows you to run JavaScript on the server side.

• Node.js is built on the V8 JavaScript engine from Google Chrome.

• It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient for handling concurrent operations.

• Node.js uses the libuv library to handle asynchronous operations and manage event loops.

• Concurrency in Node.js is achieved through event loops and ca...read more

SQL is a relational database management system, while NoSQL is a non-relational database management system.

• SQL databases are table-based and have a predefined schema, while NoSQL databases are document-based, key-value pairs, graph databases, or wide-column stores.

• SQL databases are good for complex queries and transactions, while NoSQL databases are better for hierarchical data storage and real-time web applications.

• Ex...read more

Find the 3rd highest number in an array without sorting.

• Iterate through the array to find the highest, second highest, and third highest numbers.

• Keep track of these numbers as you iterate.

• Return the third highest number once the iteration is complete.