Question

I’ve got a function wich can accept a varible number of parameter with a rest operator.

I want create an object passing the argument collected with the rest operator directly to a constructor without create an object and call an initializing function and without passing the entire array but the parameters ah I do with apply() function.

Is it possible ? Using apply doesn’t work.

public function myFunc(...arg) {

     // something link "new MyClass.apply(args)"
     return new MyClass();

}

Answer 1

Unfortunately no. There is no way to make apply work for constructor. What is done generally is to prepare a number of call based on the number of arguments :

public function myFunc(...arg):Myclass {
  switch (arg.length) {
    case 0:return new MyClass();
    case 1:return new MyClass(arg[0]);
    case 2:return new MyClass(arg[0], arg[1]);

    //... etc

    case n:return new MyClass(arg[0], arg[1],..,arg[n]);
    default: throw new Error("too much arguments in myFunc");
  }
}