Flutter: How to check if an object is an instance of a class(A stateful or stateless widget)

Question

I'm an Android developer trying to learn flutter. I'm stuck in checking whether an object is an instance of a class (A stateful or stateless widget) or not.

In Java we use like

if (object instanceOf MyClass) {
   // object is an instance of MyClass
} else {
   //  object is not an instance of MyClass
}

But i don't know how to do it in flutter.

So far I've tried,

if (object is MyClass) {
   // object is an instance of MyClass
} else {
   //  object is not an instance of MyClass
}

but this is always false.

I've seen another possible way of doing it new isInstanceOf<MyClass>() which is available in package:matcher/matcher.dart package but i don't know how to implement it properly.

Any help would be great. Thanks in advance.

Answer 1

is works perfect with Widget classes. For example I have a widget

class AccountCreationPage extends StatefulWidget {...}

Then I can check that my variable of type Widget is of AccountCreationPage class (gives true, if it is really this class):

_loginPage is AccountCreationPage ? 'Creation' : ""

Answer 2

Try using debugging your object's class:

debugprint("$<object name>");

And then manually match the class types.

That means that you will find out the needed class for the is operator.

object is <object's class>

Answer 3

You can use equals operator

class MyApp extends StatelessWidget {
    @override
  bool operator ==(Object o) {
    if (identical(this, o)) return true;

    return o is MyApp;
  }
}

Then check as following

if (object == MyApp)