SharePoint 2013 : Get SharePoint items in Knockout js observableArray

To get the list tem in the observableArray, just declare a array in the js and get as below code

list = ko.observableArray(),

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 getCourses = function () {
              var clientContext = TRANAPP.context;
              var oList = clientContext.get_web().get_lists().getByTitle('Courses');
              var myQueryString = '<View><RowLimit>1000</RowLimit></View>';
              var newQuery = new SP.CamlQuery();
              newQuery.set_viewXml(myQueryString);
              courseItems = oList.getItems(newQuery);
              clientContext.load(courseItems, 'Include(Id, Title, CourseDescription, Author)');
              clientContext.executeQueryAsync(onGettingCourses, onQueryFailed);
          },
onGettingCourses = function (sender, args) {
              var allCourse = courseItems.getEnumerator();
              while (allCourse.moveNext()) {
                  var currentCourse = allCourse.get_current();
                  list.push({
                      "Title": currentCourse.get_item('Title'),
                      "Id": currentCourse.get_id(),
                      "CourseDescription": currentCourse.get_item('CourseDescription')
                  });
              }
          },

onQueryFailed = function (sender, args) {
              alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
          },