What features do you like about JavaScript?

• I really like functions as first-class citizens, nowadays I don't even consider languages without this feature.
• Destructuring is also a great addition.

Bonus track: stuff I'd like to see added to Javascript

• Automatic currying in function invocations built into the language.
• Pattern matching.
• A special character to ignore values, like underscore in Python.

I'm somewhat fond of how function definitions and function expressions look identical. You don't need to remember some different syntax just to insert a small function somewhere.

I also really like that the language doesn't treat double quoted and single quoted strings differently. A lot of languages don't care either way these days, but it's still nice to not need to constantly remember to use double quotes like in C or Elixir.

Destructuring and the spread operator!

Lambda is nice, I really like destructuring.
It has simplified so much code for me the last few years. :)

There are a few of them

• first class JSON support
• Regex build into the language (you need them sometimes)
• functions are value.

Destructuring, Higher Order Functions, Spread Operator, Arrow Functions, async-await for asynchronous programming.