Flutter - How to instantiate an object from a Type

You cannot create an instance of a class from a Type object representing the class, at least not without mirrors (and neither the Flutter nor the web platform supports mirrors).

You cannot tear-off a constructor (yet, I hope we'll add that feature at some point), so the option of creating a static helper function which calls the constructor, and passing the helper function around, is the best current solution.

If you know the number of arguments required by such a function, you don't need to use Function.apply, you can just call it directly.

You can tear-off a function if you don't add the parentheses (). You don't need dart:mirror.

void main() {
  // Tear off a global function
  Function myFunction = MyClass.someStaticFunction;

  // Call it statically
  myFunction('arg');

  // Call it dynamically
  Function.apply(myFunction, ['arg']);

  // Tear it off with a precise Function Type
  void Function(String) myFunction2 = MyClass.someStaticFunction;
}

class MyClass {
  static void someStaticFunction(String someArg) {
    print('someStaticFunction $someArg');
  }
}