NodeJS - setTimeout(fn,0) vs setImmediate(fn)

Question

What is the difference between those two, and when will I use one over the other?

Answer 1

use setImmediate() for not blocking the event loop. The callback will run on the next event loop, as soon as the current one is done.

use setTimeout() for controlled delays. The function will run after the specified delay. The minimum delay is 1 millisecond.