The code for this is not mine. I was just going over something and saw a + before the keyword this for the first time and was wondering what it does.
+this.closest('li').getAttribute('data-index');
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Re edit: (Except in the most literal sense) the `+` isn't before `this`, it is before the entire rest of the expression: `this.closest('li').getAttribute('data-index')` – Quentin Sep 08 '21 at 08:54
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@ZlatanOmerović — Answers are better posted as answers, not comments. – Quentin Sep 08 '21 at 09:03