September 2014
Intermediate to advanced
320 pages
10h 23m
English
Content preview from Functional Programming in ScalaBecome 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,
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Chapter 11. Monads
In the previous chapter, we introduced a simple algebraic structure, the monoid. This was our first instance of a completely abstract, purely algebraic interface, and it led us to think about interfaces in a new way. A useful interface may be defined only by a collection of operations related by laws.
In this chapter, we’ll continue this mode of thinking and apply it to the problem of factoring out code duplication across some of the libraries we wrote in parts 1 and 2. We’ll discover two new abstract interfaces, Functor and Monad, and get more general experience with spotting these sorts of abstract structures in our code.[1]
1 The names functor and monad come from the branch of mathematics called category theory, but it ...
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