in Dart, how do you use `class` when stored in a variable?

Question

in Dart, you can assign a class to a variable, eg,

var klass = String;

but once assigned, how do you used it?

var str = new klass(); ===> ERROR: malformed type used

once one has a class in a variable, how does one use it to instantiate a new object of that class?

Alexandre Ardhuin · Accepted Answer · 2013-11-22 07:42:44Z

3

You have to use dart:mirrors.

import 'dart:mirrors';

class A {
  A();
  A.named(String value);
}

main() {
  final t = A;

  // same as 'new A()'
  final a1 = reflectClass(t).newInstance(const Symbol(''), []).reflectee;

  // same as 'new A.named('test')'
  final a2 = reflectClass(t).newInstance(#named, ['test']).reflectee;
}

answered Nov 22, 2013 at 7:42

Alexandre Ardhuin

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