# Functors

### Note to self

A Functor is a *design pattern* that evolves from
category theory in mathematics. Fundamentally it's a mapping between
categories that preserves the structure of the original categories
involved. It satisfies two laws: -

- Identity law: $\small{F(\operatorname{id}_A) = \operatorname{id}_{F(A)}}$
- Composition law: $\small{F(g \circ f) = F(g) \circ F(f)}$

### Reading list

# Well, now what?

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