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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
Tools
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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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Toc

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

Working with predefined lenses

In this recipe, we will work with predefined lenses. We will use a library lens-aeson for dealing with JSON data. The aeson library is a popular library for parsing and writing JSON instances for the user-defined data. Often, we have to deal with JSON, and parse it on the fly to extract the desired data.

Getting ready

In this recipe, we will use the generic JSON parser provided by aeson, and then use lens-aeson to dig through the JSON to extract the data.

How to do it...

  1. Create a new project, working-with-aeson-lens, with a simple stack...
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