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Interface Implementation

Interfaces are implemented implicitly.

A type never declares that it implements a given interface. If an interface exists and a type has the proper methods defined, then the type automatically fulfills that interface.

A quick way of checking whether a struct implements an interface is to declare a function that takes an interface as an argument. If the function can take the struct as an argument, then the struct implements the interface.

Assignment

At Textio we have full-time employees and contract employees. We have been tasked with making a more general employee interface so that dealing with different employee types is simpler.

Run the code. You should see an error indicating the contractor type does not fulfill the employee interface.
Implement the missing getSalary method for the contractor type so that it fulfills the employee interface.
- A contractor's salary is their hourly pay multiplied by how many hours they work per year.