medium10 pts · first answer countsjavascriptdom-events

Listener that will not go away

Why is the scroll handler still running after cleanup?

window.addEventListener("scroll", () => track())
// later
window.removeEventListener("scroll", () => track())

A.removeEventListener only works for click eventsB.Scroll listeners can never be removedC.Each arrow is a new function, so remove finds no matchD.remove must be called before add

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Listener that will not go away

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