Dump jquery object in an alert box

I am not quite adept in maneuvering jQuery, and it came to a point that I need to debug a program that was passed down from me without a documentation.

I have this var a, an object, that I really want to know the content of its collection. In my mind I need a function like foreach() in PHP to iterate over this object variable. Upon researching I end up in using jQuery.each(). Now I can clearly iterate and see what was inside var a.

However, it was kind of annoying to alert once every value on the var a. What I wanna know if it's possible to display all the contents in just one pop of alert box?

Here is my code:

var acc = []
$.each(a, function(index, value) {
    acc.push(index + ': ' + value);
});
alert(JSON.stringify(acc));