Learn Functional Programming in Python/

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Applicative Functors

Applicative Functors

Learn how to use applicatives with the help of the examples in this lesson.

We'll cover the following...

Applicative functors

An applicative functor wraps a function. It can apply its function to another functor. For example:

Python 3.8
from oslash import Just
from operator import neg
a = Just(3)
f = Just(neg) 
b = f.apply(a) 
print(b)

The first thing to know is that this code only works because Just isn’t only a functor, it is also an applicative functor. An ordinary functor doesn’t have an apply method. So, having wrapped our neg function in the applicative functor, f, we can apply it ...