class Task {
    constructor(id, desc, due, prio) {
        this.id = id;
        this.desc = desc;
        this.due = due;
        this.prio = prio;
    }

    print() {
        return "Id: " + this.id + " Desc: " + this.desc + " Due: " + this.due + " Prio: " + this.prio;
    }
}

t = new Task(0, 'mein Task', '2018.01.01', 1);
console.log(t.print());