We'll build a 12-hour clock functor like this one:
| Structure | A clock with 12 places for the hours |
| Transformation operation | f(x) = x + 12, where x is the hour |
First, let’s examine the functor implementation:
// src/functor/clock.gopackage functorimport ( "fmt")
Define our ClockFunctor interface to include a single function (Map):
type ClockFunctor interface { Map(f func(int) int) ClockFunctor}
Create a container to hold our list of 12 hours:
type hourContainer struct { hours []int}
When called, Map will be executed/applied to each element in the container:
func (box hourContainer) Map(f func(int) int) ClockFunctor ...
