Explain listener removal.
01
01
Understand the problem
events
02
02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
Stuck? AI Nudge Available
Get a conceptual hint to guide your logic without spoiling the final implementation.
03
03
Study the solution
The solution is waiting
Give it an honest attempt first — then compare your thinking with the full walkthrough.
04
04
Read the code
Why inline removal fails, and the fixes
// WRONG — a brand-new function each time, so removal does nothing
el.addEventListener("click", () => doThing());
el.removeEventListener("click", () => doThing()); // no-op: different reference
// RIGHT — keep ONE reference and reuse it
const handler = () => doThing();
el.addEventListener("click", handler);
el.removeEventListener("click", handler); // removed ✓
// .bind() also returns a NEW function — store it if you must remove it
const bound = obj.method.bind(obj);
el.addEventListener("click", bound);
el.removeEventListener("click", bound);
// modern alternatives
el.addEventListener("click", onceFn, { once: true }); // auto-removes
const ctrl = new AbortController();
el.addEventListener("click", a, { signal: ctrl.signal });
el.addEventListener("scroll", b, { signal: ctrl.signal });
ctrl.abort(); // removes BOTH05
05
Join the discussion
Discussion (0)
Sign in to join the discussion.
No responses yet. Be the first to share what you think.