April 2018
Intermediate to advanced
396 pages
11h 8m
English
Content preview from Scala Design Patterns - Second Edition
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Functors
A functor is one of those terms that comes from category theory in mathematics and causes a lot of pain to developers who come into functional programming and have less of a mathematical background. It is a requirement for monads, and here we will try to explain it in a way that will be easy to understand.
What is a functor? In the preceding section, we looked at monoids as a way to abstract some computation and then used them in different ways for optimization or to create more complex computations. Even though some people might not agree with the correctness of this approach, let's look at functors from the same point of view—something that will abstract some specific computations.
In Scala, a functor is a class that has a map ...
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