It is so great that code completion is already there but two things are also important to have 1- refactoring ( renaming all the incidents of same variable/ function ) 2- when you select a variable it to highlight all the occurrences of that variable
I wonder if the 1,2 are available yet as I need a JavaScript IDE to have both plus code-completion. I badly searched for all three Eclipse too. but then Eclipse doesn't have code-completion