Multiple values are assigned to one variable. How does this work?

Question

Angularjs specific code:

var deferred = $q.defer(),
    nextTransClass, prevTransClass;

What's the meaning of this? I have never seen such variable assignment.

Answer 1

They're not all assigned to the same variable; they're just being declared on the same line.

The code above is equivalent o the following:

var deferred = $q.defer();
var nextTransClass;
var prevTransClass;

P.S. There's nothing Angular specific about this (besides for $q.defer(), obviously). This is just standard vanilla JavaScript.