How to fix New Promise not support in IE browser issue?

we can use New Promise function to write asyncronization call to improve the application performance.

here is sample call to use the New Promise feature from ES6/Javascript

loadLanguage: function () {
                   return new Promise(
                        function (resolve, reject) {
                            var PreferredLanguages = [{ Description: "English", Code: "en" },
                             { Description: "French", Code: "fr" }];
                            dataViewModel.preferredLanguages(PreferredLanguages);
                            if (PreferredLanguages) {
                               
                                resolve(PreferredLanguages);
                            }
                            else{
                                reject("no Language load");
                            }
                        }
                    );
            },


however this feature is currently not support by all browser which it does not work in IE11 and below.

fortunately we still can make it work around with $.Deferred from JQuery

the code below will demonstrate the same result as the previous code within  new Promise constructor.

 loadLanguage: function () {
                var deferred = $.Deferred();

                var PreferredLanguages = [{ Description: "English", Code: "en" },
                { Description: "French", Code: "fr" }];
                dataViewModel.preferredLanguages(PreferredLanguages);
                if (PreferredLanguages) {

                    deferred.resolve(PreferredLanguages);
                }
                else {
                    deferred.reject("no Language load");
                }
                return deferred.promise();
            },