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)

Getting started with Snap

In this recipe, we will install Snap and create our first Snap application. The Snap Framework is not (yet) part of the official list of packages on Stackage. Hence, to get started with Snap, we will have to build the Snap Framework ourselves.

How to do it...

  1. Open a console, change the directory to the desired location, and clone the snap-templates framework, as follows:
        git clone https://github.com/snapframework/snap-templates.git
  1. The snap-templates package does not have a stack.yaml file generated. Generate a new one.
        stack --resolver lts-9.1 init --solver --ignore-subdirs

At the moment, lts-9.1 is the latest LTS available with stack. We also need to ignore the subdirectories...