If you just follow a few relatively simple rules JS is actually very nice and "reliable". Those "rules" are also relatively straight forward: let/const over var, === unless you know better, make sure you know about Number.isInteger, isSafeInteger, isObject etc etc. (there were a few more rules like this - fail to recall all of them - has been a few years since i touched JS) - hope you get the idea.

Also when I looked at JS I was just blown away by all the things people built on top of it (babel, typescript, flowtype, vue, webpack, etc etc).