Making sure all elements are processed in a JQuery call
There is absolutely no need for the synch part - JavaScript is synchronous, and you should not get into a situation where the processing of that function (the one you're showing) will not be completed before the next line runs. 

(By the way, that function you have there can be rewritten for greater efficiency) 

var indexArray = $('.views').map(function(){
    return this.value;
}).get();




Let's assume that you are doing something async in that each loop, for instance, ajax calls. Your best bet is to keep a count of how many of the calls are completed in the callback function, then execute the rest of your code when the last callback function is called: 

var views = $('.views'), 
    completed = 0,
    total = views.length;

views.each(function(){
    someAsyncFunction (function(){
        // Process data
        if(++completed === total) {
            // We're done! Let's move on..
        }
    });
});


This can be abstracted away into another function, though doing that is left as an exercise for the reader.