It sounds like you're describing ES6 arrow notation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
You could always use transpile to js language like CoffeeScript or ClojureScript for a nicer syntax. Combines it with build system like Gulp or Grunt really makes the experiences pretty painless.
Although a shorter function syntax with default-return on everything would make it a lot nicer (and more similar to LISP).