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Haskell Cookbook

You're reading from   Haskell Cookbook Build functional applications using Monads, Applicatives, and Functors

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781786461353
Length 396 pages
Edition 1st Edition
Languages
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Author (1):
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Yogesh Sajanikar Yogesh Sajanikar
Author Profile Icon Yogesh Sajanikar
Yogesh Sajanikar
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Table of Contents (13) Chapters Close

Preface 1. Foundations of Haskell FREE CHAPTER 2. Getting Functional 3. Defining Data 4. Working with Functors, Applicatives, and Monads 5. More about Monads 6. Working with Common Containers and Strings 7. Working with Relational and NoSQL Databases 8. Working with HTML and Templates 9. Working with Snap Framework 10. Working with Advanced Haskell 11. Working with Lens and Prism 12. Concurrent and Distributed Programming in Haskell

Using Either

Similar to Maybe, another data type that is used often in Haskell is Either. While Maybe decides to map something or nothing, Either goes with two types and keeps either of them. In this recipe, we will construct a safe division using the Either data type and will see how we can represent the error messages in a better way.

Getting ready

Use the following command to create a new project called using-either using the simple template:

    stack new using-either simple

Change into the newly created project directory.

How to do it...

  1. Open src/Main.hs.
  2. Import...
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