To prove to ourselves that our accessor is now checking the length of values, we can attempt to assign a name longer than 10 characters and verify that we get an error.Ī couple of things to note about accessors:įirst, accessors require you to set the compiler to output ECMAScript 5 or higher.ĭownleveling to ECMAScript 3 is not supported. The protected modifier acts much like the private modifier with the exception that members declared protected can also be accessed within deriving classes.
When we try to assign from an Employee to Animal we get an error that these types are not compatible.Įven though Employee also has a private member called name, it’s not the one we declared in Animal. However, this is not the case for Employee. We create some instances of these classes and then try to assign them to each other to see what will happen.īecause Animal and Rhino share the private side of their shape from the same declaration of private name: string in Animal, they are compatible. We also have a new class Employee that looks identical to Animal in terms of shape. In this example, we have an Animal and a Rhino, with Rhino being a subclass of Animal. Types have separate declarations of a private property 'name'. 2322 Type 'Employee' is not assignable to type 'Animal'.
Animal = employee Type 'Employee' is not assignable to type 'Animal'.
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