Learning Functional Programming in Go

Fingers times 10 functor

As mentioned before, a functor consists of a structure and a transformation operation:

Structure	Five fingers, each representing an integer
Transformation operation	f(x) = x * 10

From the last chapter, we know that a category consists of the following:

• Grouping of objects
• Objects: Dots/points/a primitive with no properties and no structure
• Morphism (arrow): Something that goes between two objects/elements

Can you see the objects (the numbers on each finger)?

Can you see the mappings (1 to 10, 2 to 20, 3 to 30, and so on)?

The fact that our category is closed under multiplication, has an identity element, ...