Book Image

Haskell Cookbook

Book Image

Haskell Cookbook

Overview of this book

Haskell is a purely functional language that has the great ability to develop large and difficult, but easily maintainable software. Haskell Cookbook provides recipes that start by illustrating the principles of functional programming in Haskell, and then gradually build up your expertise in creating industrial-strength programs to accomplish any goal. The book covers topics such as Functors, Applicatives, Monads, and Transformers. You will learn various ways to handle state in your application and explore advanced topics such as Generalized Algebraic Data Types, higher kind types, existential types, and type families. The book will discuss the association of lenses with type classes such as Functor, Foldable, and Traversable to help you manage deep data structures. With the help of the wide selection of examples in this book, you will be able to upgrade your Haskell programming skills and develop scalable software idiomatically.
Table of Contents (13 chapters)

Working with the Reader monad transformer

In the previous recipe, we implemented our own State Monad transformer. In this recipe, we will revisit the mtl library and use the Reader monad transformer. The Reader monad transformer is a restricted version of the State Monad transformer in which we are allowed only to get the state (but not modify it).

How to do it...

  1. Create a new project read-trans using the simple Stack template.
  2. Open read-trans.cabal and add the following dependencies in the build-depends subsection of the executable section:
        executable read-trans
hs-source-dirs: src
main-is: Main.hs
default-language: Haskell2010
build-depends: base >= 4.7 && < 5
...