← 🟩 Node.js Foundations10 / 25
Lesson 10 — Emitter with once
Fire a listener a single time
A once listener auto-removes after the first event.
Why it matters: one-time setup and handshakes need it.
Task
Log "ready" only on the first emit, not the second.
Keep going with Node.js Foundations
Ready for more? These paid resources pick up where this lesson leaves off.
UdemyBestsellers
Top-rated Node.js Foundations courses
Project-based Node.js Foundations video courses — the perfect paid next step after these free lessons.
Browse on Udemy →AmazonReader picks
Best Node.js Foundations books
Hand-picked Node.js Foundations books to master the fundamentals offline.
See on Amazon →Some links on this page are affiliate links: we may earn a commission at no extra cost to you. We only recommend tools we believe are genuinely useful.