Web Development with Node.JS and MongoDB (Video 8)

This video tutorial covers the core stack, event loop, and event emitter in JavaScript. It explains the core stack's role in debugging, demonstrates the call stack in action, and discusses the JavaScript concurrency model, including the event loop, heap, and message queue. The tutorial also introduces the event emitter, its methods, and how to create custom event emitters. The video concludes with a preview of the next topic on streams.

What is the primary function of the core stack in programming?

• To allocate memory for objects

• To handle user inputs

• To manage function calls and execution order

• To store global variables

Why is it important to avoid making too many function calls?

• It can increase network latency

• It can cause the stack to overflow

• It can lead to memory leaks

• It can slow down the CPU

What are the three main components of the JavaScript concurrency model?

• Core stack, heap, and message queue

• Heap, stack, and event handler

• Message queue, event loop, and stack

• Core stack, event handler, and heap

How does the event loop process messages?

• By executing them in parallel

• By storing them in the heap

• By processing them one at a time when the stack is empty

• By prioritizing messages based on their size

What is the purpose of the 'once' method in an event emitter?

• To add a listener that executes multiple times

• To add a listener that executes only once

• To emit an event without arguments

• To remove a listener after it executes once

How can you remove all listeners for a specific event in an event emitter?

• Using the 'clearListeners' method

• Using the 'removeAllListeners' method

• Using the 'off' method

• Using the 'removeListener' method

What is required to create a custom module that extends from an event emitter?

• Load the 'util' and 'events' modules, initialize properties, and export the module

• Create a new class and inherit from the 'EventEmitter' class

• Use the 'extend' method from the 'events' module

• Directly modify the 'EventEmitter' prototype