I haven't used SRS for js specifically, but I've been using it lately to cement certain Ruby concepts. Best advice I can give is that it's totally worth it, bu

I haven't used SRS for js specifically, but I've been using it lately to cement certain Ruby concepts. Best advice I can give is that it's totally worth it, but don't take shortcuts when authoring cards. Take the time to separate concepts into bite-sized, more simple (Rich Hickey simple, not "easy" simple) concepts, and write questions that elicit that knowledge. Also, Anki is free for both desktop (every OS) and Android.