Node Developer Interview Questions and Answers

The event loop is a mechanism in programming that allows for asynchronous operations to be executed efficiently.

• The event loop is a single-threaded mechanism that manages the execution of multiple tasks in a non-blocking manner.

• It continuously checks for tasks in the event queue and executes them one by one.

• Asynchronous operations like I/O operations or timers are handled by the event loop to prevent blocking the main thread.

• Node.js utilizes the event loop to handle asynchron...read more

Streams are a way to handle reading/writing data in chunks instead of loading it all at once.

• Streams are instances of EventEmitter class

• They can be readable, writable or duplex

• They can be used for handling large files or network data

• Examples include fs.createReadStream(), http.ServerResponse

Nodejs is single threaded to optimize performance and avoid blocking I/O operations.

• Nodejs uses an event loop to handle I/O operations asynchronously.

• Single threaded architecture simplifies development and debugging.

• Nodejs can still handle multiple requests concurrently through event-driven programming.

• Worker threads can be used for CPU-intensive tasks.

• Examples of blocking I/O operations include file system operations and network requests.

Event loop is a mechanism in JavaScript that allows for asynchronous non-blocking operations.

• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows for non-blocking I/O operations by continuously checking the call stack and the callback queue.

• Event loop ensures that the JavaScript runtime is not blocked by long-running tasks.

• Example: setTimeout() function in JavaScript uses the event loop to execute a callback function after a specified delay.