12 Applicative and traversable functors
This chapter covers
- Defining the applicative and traversable functor algebraic structures
- Applicatives and monads: relationship, differences, and trade-offs
- Proving applicative laws
- Working with traversable structures
- Monad composition using the monad transformer
In the previous chapter on monads, we saw how a lot of the functions we’ve been writing for different data types and combinator libraries can be expressed in terms of a single interface, Monad. Monads provide powerful functionality, as we’ve seen by the fact that we can use flatMap to write what seems like an imperative program in a purely functional way.
In this chapter, we learn about a related abstraction, the applicative functor, which ...
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