library.js

(function() {
    var Drop = window.Drop = function() { 

        var files = [];
        
        var add = function(word) {
              files.push(word);    
              return files;
        }
    
        return {
            files: files,
            add: add
        }
    }
})()


// All of these seem to be the same?
var a = Drop();
var b = new Drop();
var c = new Drop;

// Each has their own state which is what I want.
a.add("file1");
b.add("file2");
c.add("file3");