January 2014
Beginner
428 pages
14h 1m
English
Content preview from Beginning Haskell: A Project-Based Approach
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CHAPTER 4
Using Containers and Type Classes
You have seen how parametric polymorphism and higher-order functions help in the process of abstraction. In this chapter, I’ll introduce a new kind of polymorphism that sits in between parametric and the absence of polymorphism: ad hoc polymorphism. Using this feature, you can express that certain types exhibit a common behavior. And incidentally, you will learn how Haskell makes it possible to use addition, (+), on different numeric types while maintaining a strong type system.
Containers will be used in the examples throughout this chapter. A container is any data structure whose purpose is to hold ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.