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Because Object is a root of the non-nullable Dart class hierarchy, every other non-Null Dart class is a subclass of Object.
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var x = [32,4424];
print(x.runtimeType);
O/P:-
JSArray<int>
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What are types in Dart?
The Dart type system
1 Field and method inference.
2 Static field inference.
3 Local variable inference.
4 Type argument inference.