Destroy event or callback of an object in nodejs

Question

I know javascript does not have destroy method, but my object needs to know when it ceases to exist.

class MyObject
{
    constructor()
    {
        this.interval = setInterval(this.checker, 5000);
    }

    checker()
    {
        // Stuff
    }

    beforeDestroy()
    {
        clearInterval( this.interval );
    }
}

I would like to clear a timeout and an interval before it's being destroyed. I'm not finding it, I'm assuming it is not possible but I would like to be sure. Any node.js version, experimental or using custom module is ok.

A solution totally depends on how MyObject is used.

Estus Flask
– Estus Flask

2018-11-08 15:49:55 +00:00
Commented Nov 8, 2018 at 15:49 — Estus Flask
– Estus Flask, Commented Nov 8, 2018 at 15:49

Estus Flask · Accepted Answer · 2018-11-08 15:57:37Z

1

Cause and effect relationship is mixed up here. It's not possible to determine the moment of time when MyObject instance is destroyed. Usually objects that aren't referenced anymore can be garbage-collected.

beforeDestroy is usually implemented by frameworks as a hook, e.g. AngularJS $onDestroy, Angular ngOnDestoy, React componentWillUnmount. A place that is responsible for MyObject instantiation should also be responsible for calling beforeDestroy when it's known that an instance is not needed anymore. Then an instance can be garbage-collected.

answered Nov 8, 2018 at 15:57

Estus Flask

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