1. Dart
2. dart:js
3. JsObject
4. operator []= method

JsObject class

1. Constructors
2. JsObject
3. fromBrowserObject
4. jsify
5. Properties
6. hashCode
7. runtimeType
8. Methods
9. callMethod
10. deleteProperty
11. hasProperty
12. instanceof
13. toString
14. noSuchMethod
15. Operators
16. operator ==
17. operator []
18. operator []=

void operator []=(property, value) {
  if (property is! String && property is! num) {
    throw ArgumentError("property is not a String or num");
  }
  JS('', '#[#] = #', _jsObject, property, _convertToJS(value));
}