Experiments in Purely Functional TypeScript

Recently, I’ve been experimenting with using functional programming in my side projects. Today, I want to share some of what I’ve learned, focusing on utilities I’ve created to facilitate purely functional TypeScript programming. Different Ways to Define Similar Functions Here are three versions of *roughly* the same function: const doubleAll = (array: number[]) => { […]

Functional C# Application Composition, Part 3: MethodToDelegate

In part 2 of this series I made a case that switching from Stateless Single-Responsibility Objects to delegates and static methods lets us write simple, pure functions and lets us remove a lot of boilerplate. Nevertheless, there was still one bit of boilerplate I hadn’t yet removed. It dealt with encapsulating dependencies to a method […]

Functional C# Application Composition, Part 2: Delegates

In my previous post on the Stateless Single-Responsibility Object (SSRO) approach to C# application composition I reviewed the concept and its shortcomings. To recap: You end up with a ton of classes splitting up semi-related logic across multiple files. This is necessary to conform to the classname == filename convention. In order to mock, you […]

Functional C# Application Composition, Part 1: Shortcomings of Single-Responsibility Objects

Functional code is easier to test than code with state or side effects. However, most developers spend the majority of their time in traditional, imperative languages. There’s plenty of value in those imperative languages, but these days when I use one, I also try to bring in applicable functional concepts. In this post I will […]