Introduction to Type Classes
Explore the concept of type classes in Haskell, such as Show and Eq, to understand how they define operations for data types. Learn to derive and customize type class instances and apply type class constraints to polymorphic functions for greater type safety and functionality.
We'll cover the following...
We'll cover the following...
In the previous lesson, we defined our own data type for geometric shapes. In order to make them printable, we had to add deriving (Show) to our type declaration.
Show is an example of a Haskell type class. We also encountered the type class Eq, already, in type annotations of polymorphic functions (e.g. elem), where it acted as a ...