March 2018
Beginner
616 pages
16h 53m
English
Content preview from Get Programming with Haskell
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Lesson 14. Using type classes
After reading lesson 14, you’ll be able to
- Implement your own type classes
- Understand polymorphism in Haskell
- Know when to use deriving
- Search for documentation with Hackage and Hoogle
In lesson 13, you got your first look at type classes, which are Haskell’s way of grouping types by common behaviors they share. In this lesson, you’ll take a deeper look at how to implement existing type classes. This will allow you to write new types that take advantage of a wide range of existing functions.
Consider this
You have a data type consisting of data constructors for New England states:
data NewEngland = ME | VT | NH | MA | RI | CT
You want to be able to display them by their full name by using Show. You ...