Forget about Coursera, Udacity, edX... etc, they just bring (sh**y university system) into the (lovely online self-learning world).
I have tried EVERY SINGLE e-learning out there (I seriously tried a list of about 50 websites one by one)... I would say Pluralsight is the best.
And on some specific topics, you gotta find the best instructor for each topic, examples:
C# & ASP (basics, intermediate, advanced), Scott Allen Pluralsight: app.pluralsight.com/profile/author...
Design Patterns in C#, Dimitri udemy: udemy.com/design-patterns-csharp-d...
Python & Django, Kenneth Love: teamtreehouse.com/tracks/exploring...
That being said, what's the topic you're looking for?
Yeah, I think if you can find it what you need on Pluralsight, it has a greater chance of being good quality.
I don't know what you wanna do with JS, is it frontend dev? cuz I have never heard that JS and Data Science go together, I heard about R & Python going with DS (I don't know a lot about DS).
This ES6 course is really good:
JS is been used for DS lately. I would recommend getting up-to-speed with it. However, it is always nice to have Python as your backup language for DS/ML.
Ah... js is eating the world man, with no typing :D
The only downside is that you have to know your way around CPU intensive tasks. The biggest issue with JS is that the Math engine is not as powerful/accurate on floating-point operations.
I learn in layers:
2 . For frameworks, for me at least, their official documentation is enough, once you know the concepts is just a matter of finding the right function and its parameters to do your work.
3 . Youtube has tens of free yearly conferences, including ~5 JS Confs, CSS Confs, hardware, even one for programming languages designs. This is where you find specific examples, solution to real dev problems and how the theory meets the practice.
Other similar websites (do not know if they have something front-end specific):
For frontend the dailyui is an invaluable resource I've found. Also if you're into new frameworks there's egghead.io and thinkster.io. Recently I've found a site (codecourse.com) that has some good looking content, haven't really tried much so wouldn't know what their courses are about.
I've used Front End Masters and Tylermcginnis.com to land my current job and continue to use them now.
Oh yeah and egghead.io
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