tutorial-cat

Code for the Pragmatic Introduction to Category Theory.

Slides and video are now available online!

Installation

• clone the repo
• sbt test:compile
• sbt run
• if you see the secret message you are good to go!

Agenda

Intro

Monoid

• Define a monoid for Int
• Define a monoid for String

sbt 'testOnly *Monoid*'

Functor

• Define a functor for Maybe
• Define a functor for ZeroOrMore

sbt 'testOnly *Functor*'

Applicative

• Define map in terms of ap and pure
• Define an applicative for Maybe
• Define an applicative for ZeroOrMore

sbt 'testOnly *Applicative*'

Monad (1)

• Define flatten using flatMap
• Define map using flatMap and pure
• Define ap using flatMap and map

Monad (2)

• Define a monad for Maybe
• Define a monad for ZeroOrMore

sbt 'testOnly *Monad*'

Solutions

Solution of the exercises are available here