event ∞

Question 1

What is the JavaScript Event Loop?

Answer 1

responsible for executing the code, collecting and processing events, and executing queued sub-tasks

one job: look at stack and task queue

if the stack is empty, pushes whatever is on the task queue

first in, first out (FIFO)

Question 2

What is different between “blocking” and “non-blocking” with respect to how code is executed?

Answer 2

Handling I/O is typically performed via events and callbacks, so when the application is waiting for something like a database query to return or an api request to return, it can still process other things like user input

blocking: ‘stack is full and waiting for processes”
nonblocking:

event loop is what allows Node.js to perform non-blocking I/O operations — despite the fact that JavaScript is single-threaded — by offloading operations to the system kernel whenever possible

Question 3

what separates javascript from other languages?

Answer 3

Prototypal Inheritance, how this works, closures, and the event loop

Question 4

what’s critical for modern web dev?

Answer 4

asynchronous programming

Question 5

process

Answer 5

node/web -> callback queue (FIFO) -> event loop -> call stack (LIFO)