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)

Creating custom data types

In the model definition for Persistent, we can use data types such as Int, Text, and Int64. They are translated to proper SQL data types according to the SQL dialect that we are working with. Sometimes, the supported data types are not sufficient for our needs, and we might want to write a custom data type.

In this recipe, we will write a custom data type that represents email.

How to do it...

  1. Create a new project called custom-datatype with the simple stack template:
        stack new custom-datatype simple
  1. Add dependencies on the persistent, persistent-template, persistent-sqlite, text, and mtl libraries in the build-depends sub-section of the executable section. Also add email-validate as a...