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How can I determine whether an object is of a class or not in the Dart language?
I'm looking to do something like the following:
if (someObject.class.toString() == "Num") { ... } And what is the returned value type? Will it have to be a String?
The mirror library has been up and down and seems to be subject to rapid change right now, as the one thing I did find simply did not work as shown.
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object: an object is an element (or instance) of a class; objects have the behaviors of their class. The object is the actual component of programs, while the class specifies how instances are created and how they behave. method: a method is an action which an object is able to perform.
A class can create objects of itself with different characteristics and common behaviour. So, we can say that an Object represents a specific state of the class. For these reasons, an Object is called an Instance of a Class.
The isinstance() method checks whether an object is an instance of a class whereas issubclass() method asks whether one class is a subclass of another class (or other classes).
Instance − An individual object of a certain class. An object obj that belongs to a class Circle, for example, is an instance of the class Circle. Instantiation − The creation of an instance of a class.
Recently Object got the runtimeType getter. So now, we may not only compare type of object with another type, but actually get the class name of an object.
As in:
myObject.runtimeType.toString() Furthermore, in the current version of Dart, you can skip the toString operation and directly compare runtimeType of object with target type:
myObject.runtimeType == int or
myObject.runtimeType == Animal If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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