How to determine that all the files have been read and resolve a promise

Question

The following code is responsible for reading files. My requirement is how to find whether all files has been read so that I can return or resolve a promise from the parent fun

Answer 1

What if I change the code structure to this

 $.when(readmultifiles(files)).then(
                        function(status) {
                            alert(status + ", things are going well");
                        },
                        function(status) {
                            alert(status + ", you fail this time");
                        },
                        function(status) {
                            $("body").append(status);
                        }
                );
       function readmultifiles(files) {

            var dfrd = $.Deferred();
            // Read first file
            setup_reader(files, 0);

            function setup_reader(files, i) {
                var file = files[i];
                var name = file.name;
                var reader = new FileReader();
                reader.onload = function(e) {
                    readerLoaded(e, files, i, name);
                };
                reader.readAsBinaryString(file);
                // After reading, read the next file.
            }

            function readerLoaded(e, files, i, name) {
                // get file content  
                var bin = e.target.result;
                // do sth with text

                namee.push(name);
                // If there's a file left to load
                if (i < files.length - 1) {
                    // Load the next file
                    setup_reader(files, i + 1);
                } else {
                    dfrd.resolve(namee.join(','));
                }
            }
            return dfrd.promise();
      }