Closure memory investigation

Briefing

Why does removing a listener sometimes free nothing, and why can a tiny function retain an enormous object?

A one-line callback keeps a 40MB array alive for the lifetime of the page. Find out which line did it.

Laboratory

JavaScript Lab

Level

RESEARCHER

Estimated time

10 minutes

Method

investigation

Variables under observation

closuresenvironment recordreachabilitygarbage collectionleaks