# 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.

## 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.

Add the missing `getSalary` method to 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.