running customized tasks with one interface run() in Javascript

running-tasks-in.js

(function() {
        // object taskA
        function taskA(name) {
                this.name = name;
        }

        taskA.prototype.name = null;
        taskA.prototype.run = function() {
                console.log("taskA is running");
                return true;
        };

        // object taskB
        function taskB(name) {
                this.name = name;
        }

        taskB.prototype.name = null;
        taskB.prototype.run = function() {
                console.log("taskB is running");
                return true;
        }

        function runTask(task) {
                if (task.run) {
                        return task.run();
                } else {
                        return false;
                }
        }

        function runTasks(tasks) {
                var r = false;
                if (!tasks instanceof Array) {
                        return r;
                }
                for(var i=0; i<tasks.length; ++i) {
                        if (tasks[i].run) {
                                r = tasks[i].run();
                                if (r === false) {
                                        return false;
                                }
                        }
                }
                return true;
        }

        var A = new taskA("taskA");
        var B = new taskB("taskB");

        runTask(A);
        runTask(B);

        var tasks = [A, B];

        runTasks(tasks);

})();