F# Domain Model Validation with Active Patterns

In this post, we will look at how F#'s feature Active Patterns can help build a clear, declarative solution for the Validation of Domain Models. By using a Partial Pattern for each Business Rule, we can clearly see how the input is restricted to verify each rule.

Azure Function Proxies - Part 2: Easily enable hybrid integration.

Connecting cloud services to on premises API's can be quite challenging. Depending on your setup, there are multiple options available. The most enterprise grade options reside on the network level: ExpressRoute and Site-to-Site VPN. Another option is leveraging Azure App Service Hybrid Connections, which gives you a very simple way to connect to on premise resources on the TCP level, in a firewall-friendly and high available manner. This blog will demonstrate how you can consume an on premises API via Azure Function Proxies, without any coding at all.

Property-Based Testing with C#

“Property-Based Testing”, ever heard of it? It’s a very popular topic in the functional community. The opposite of this approach is the well-known “Example-Based Testing”. People think in examples and that’s why it’s so popular; also in the non-functional community. This is/was the way we write/wrote tests.“Given a static, constant example; the output should be this”But is that the best we can do?

Azure Function Proxies - Part 1: Represent heterogenous service operations into a single API

When using the Microsoft Azure stack, an important aspect is to use the right service for the job. In this way, you might end up with an API that is composed of several Azure services such as Blob Storage, Logic Apps and Azure Functions. In order to publish such an API in a unified way, you can leverage Azure Functions Proxies.

F# Coin Change Kata with Property-Based Testing

Using F# and Property-Based Testing to solve the Coin Change Kata really helped me to get more insight in the Property-Based Testing technique; I hope it will help you also.

F# Agent Pipeline Processing in Concurrent Applications

How can we use the F# Agent to set up a pipeline which can be used in Concurrent Applications? We need not only a working version but also a declarative version which we can easily extend and maintain.