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Haskell Design Patterns

You're reading from   Haskell Design Patterns Take your Haskell and functional programming skills to the next level by exploring new idioms and design patterns

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Product type Paperback
Published in Nov 2015
Publisher
ISBN-13 9781783988723
Length 166 pages
Edition 1st Edition
Languages
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Author (1):
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Ryan Lemmer Ryan Lemmer
Author Profile Icon Ryan Lemmer
Ryan Lemmer
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Chapter 2. Patterns for I/O

 

"I believe that the monadic approach to programming, in which actions are first class values, is itself interesting, beautiful and modular. In short, Haskell is the world's finest imperative programming language"

 
 --Tackling the Awkward Squad, Simon Peyton Jones

It is remarkable that we can do side-effecting I/O in a pure functional language!

We start this chapter by establishing I/O as a first-class citizen of Haskell. A the bulk of this chapter is concerned with exploring three styles of I/O programming in Haskell.

We start with the most naïve style: imperative style. From there, we move on to the elegant and concise "lazy I/O", only to run into its severe limitations. The way out is the third and last style we explore: iteratee I/O.

As a binding thread, we carry a simple I/O example through all three styles. We will cover the following topics:

  • I/O as a first-class citizen
  • Imperative I/O
  • Lazy I/O
  • The problem with...
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