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Discussion on: Are you sure you know how event propagates in JavaScript?

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pgoldrbx profile image
Phil Gold

Thank you for this! I had a bad interview a month ago where the question came up as to how to execute the parent node handler first and despite 20 years of experience I really could not remember. There just hasn’t been a scenario I’ve needed to do this and my past reading of useCapture in the docs was not coming to me. Today I got the answer and it was a wonderful reminder. Thank you!

The only thing that could make this post better might be an example of how this might be useful. I can imagine some analytics cases but that’s not direct functionality.

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aman_singh profile image
Amandeep Singh Author

Thanks for your feedback. I am sorry to hear about your interview.

Regarding the capturing phase, I haven't seen/found any practical use cases of it yet.

But the bubbling phase is the core of event delegation.

Interestingly, React uses this mechanism to attach all of your event handlers at the root DOM container (v17).

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elabftw profile image
eLabFTW

What is interesting here is that Phil failed his interview for not remembering something that IS NOT USEFUL, or maybe is in some very weird corner case...

Anyway, nice article Amandeep!

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aman_singh profile image
Amandeep Singh Author

Thanks for your comment. 🙂👍

I am surprised that someone could test you based on if you know how event capturing works. These things are not what we do everyday and thus hard to come by, or you just forget. And that's why docs are there when you need a refresher.

I totally don't condone these interviews. I personally would stay away from these if I could.

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elabftw profile image
eLabFTW

Agreed. It's stupid to expect someone to know everything there is to know about web technologies. There is so much to know (and then more) that questioning someone without the ability to google something is pointless. A better test would be to look at how someone would solve a particular problem with all the tools at their disposal.

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jamesthomson profile image
James Thomson

A better test would be to look at how someone would solve a particular problem with all the tools at their disposal.

Exactly this. Testing how a candidate can memorise and regurgitate documentation is useless. Test how they solve problems and how they interact with you and your team. This is how you find good developers that your team can work with (which is just as, if not more, important as the candidates skillset).