Ask HN: What's the best resource for existing programmers to learn JavaScript?

Mate, "learn JS" is a little too vague. There is A LOT in the JS world so you need to narrow down your focus. It depends on what youre doing but reading docs, youtube, udemy, blogs, freecodecamp, theodinproject. all great resources.

I liked Wes Boss’ js for beginners course. My favorite part was that he was basically trying out the concept and showing how the language works by experimentation.

I have written a lot of JS but this approach brought needed clarity about the inner workings of the language.

MDN is always a valuable resource, especially if you are interested in the JavaScript language itself or in web frontend development.

https://developer.mozilla.org/en-US/docs/Web/JavaScript

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guid...

I've always liked https://javascript.info/

The Helsinki MOOC is great and was just upgraded to JS.

https://fullstackopen.com/en/

I wrote my JavaScript book for people who already know how to program – maybe it works for you. Free to read online: https://exploringjs.com/impatient-js/