The ease at which we modularized these reducers speaks to just how modular this architecture is by default. We didn’t have to make any striking refactors or changes to logic because the boundaries are already very clearly defined. The worst things got was the need to introduce a little extra boilerplate for a component that had more complex state.
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References
The Many Faces of Map
Brandon Williams & Stephen Celis • Apr 23, 2018Why does the map function appear in every programming language supporting “functional” concepts? And why does Swift have two map functions? We will answer these questions and show that map has many universal properties, and is in some sense unique.
Contravariance
Brandon Williams & Stephen Celis • Apr 30, 2018We first explored the concept of “positive” and “negative” position of function arguments in our contravariance episode. In this episode we describe a very simple process to determine when it is possible to define a map or pullback transformation on any function signature.Let’s explore a type of composition that defies our intuitions. It appears to go in the opposite direction than we are used to. We’ll show that this composition is completely natural, hiding right in plain sight, and in fact related to the Liskov Substitution Principle.
Why Functional Programming Matters
John Hughes • Apr 1, 1989A classic paper exploring what makes functional programming special. It focuses on two positive aspects that set it apart from the rest: laziness and modularity.
Access Control
AppleThis chapter of the Swift Programming Language book explains access control in depth and how it affects module imports.
Elm: A delightful language for reliable webapps
Elm is both a pure functional language and framework for creating web applications in a declarative fashion. It was instrumental in pushing functional programming ideas into the mainstream, and demonstrating how an application could be represented by a simple pure function from state and actions to state.
Redux: A predictable state container for JavaScript apps.
The idea of modeling an application’s architecture on simple reducer functions was popularized by Redux, a state management library for React, which in turn took a lot of inspiration from Elm.
Composable Reducers
Brandon Williams • Oct 10, 2017A talk that Brandon gave at the 2017 Functional Swift conference in Berlin. The talk contains a brief account of many of the ideas covered in our series of episodes on “Composable State Management”.
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