Hands-On High Performance with Go

Functors

A functor is a functional programming paradigm in which a transformation is performed on a structure while the structure is preserved.

In our example, we take an integer slice, intSlice, and lift the slice into a functor. IntSliceFunctor is an interface that includes the following:

• fmt.Stringer, which defines the string format for the value with its representation.
• Map(fn func(int int) IntSliceFunctor – this mapping applies fn to each element in our slice.
• A convenience function, Ints() []int, which allows you to get the int slice the functor holds.

After we have our lifted slice, we can perform operations on our newly created functor. In our example, we perform a square operation and a modulus three operation. The following is ...