setImmediate vs process.nextTick in Node.js - Quick Revision & Key Differences

Recall & Review

beginner

What does process.nextTick() do in Node.js?

process.nextTick() schedules a callback function to run immediately after the current operation completes, before the event loop continues.

intermediate

How does setImmediate() differ from process.nextTick()?

setImmediate() schedules a callback to run on the next iteration of the event loop, after I/O events, while process.nextTick() runs callbacks before the event loop continues.

intermediate

Why should you avoid using process.nextTick() recursively without limits?

Because it can block the event loop by continuously running callbacks before I/O, causing the program to freeze or delay other operations.

beginner

In what scenario is setImmediate() preferred over process.nextTick()?

When you want to schedule a callback to run after I/O events and timers, letting the event loop continue before running your code.

beginner

Which method runs callbacks sooner: process.nextTick() or setImmediate()?

process.nextTick() runs callbacks sooner, immediately after the current operation, before the event loop continues.

When does process.nextTick() execute its callback?

A After I/O events are processed

B Before the next event loop phase starts

C On the next iteration of the event loop

D After timers expire

process.nextTick() callbacks run immediately after the current operation, before the event loop continues.

Which method schedules a callback to run on the next event loop iteration?

A process.nextTick()

B setTimeout() with 0 delay

C Promise.resolve().then()

D setImmediate()

setImmediate() schedules callbacks to run on the next event loop iteration, after I/O events.

What risk does using process.nextTick() recursively pose?

A Memory leaks

B Slower callback execution

C Blocking the event loop

D Skipping I/O events

Recursive process.nextTick() calls can block the event loop, preventing other operations from running.

Which method allows I/O events to be processed before running its callback?

A setImmediate()

B process.nextTick()

C Promise.then()

D setTimeout() with 0 delay

setImmediate() runs callbacks after I/O events, letting the event loop process them first.

Which of these runs callbacks earliest in the Node.js event loop?

A process.nextTick()

B setImmediate()

C setTimeout()

D I/O callbacks

process.nextTick() callbacks run before any other event loop phases.

Explain the difference between setImmediate() and process.nextTick() in Node.js.

Think about when each callback runs relative to the event loop phases.

Describe a situation where using process.nextTick() might cause problems.

Consider what happens if callbacks keep scheduling themselves immediately.