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Asked: 2026-06-02T23:07:26+00:00

I used to create instances of my JavaScript classes using the new keyword and

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I used to create instances of my JavaScript “classes” using the new keyword and call the constructor like: new myStuff.DoSomething(); in order to get an instance of it. Sometimes when needed I give the instance a reference like: var myObj = new myStuff.DoSomething();

I come to think about the memory management: does JS clean up the objects without references when they aren’t used anymore? – the same way it would clean up those with references. And what about all event handlers in a killed object, do they still live on?

Example: If I create, for instance, a draggable window using the new keyword and no reference to the object and then attach event handlers and so on. Then I decide to delete the window from the DOM. How can I make sure the actual object is removed as well?

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1 Answer

  1. Editorial Team

    Does JS clean up the objects without references when they aren’t used anymore?

    Yes. JavaScript is a garbage collected language.

    And what about all event handlers in a killed object, do they still live on?

    It depends, since we’re now talking about the DOM, and not just JS as a language. Certain DOM implementations (such as in older versions of IE) are notorious for leaking memory in this way. Other browsers/DOM implementations may not have such bugs.

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