Programming

Shortcodes for simple post lists in WordPress

Recently, I worked on my theme for KeesTalksTech. To gain performance, I need to rely less on plugins, that’s why I needed a simple way to show small lists of posts in my sidebar.

I’ve created 2 short codes: one that shows recent posts, used in the new section and one that shows specific posts, used in the highlights section.

A Stack data structure in TypeScript

The JavaScript Array has everything to acts as a nice Stack structure, the only thing is missing is a peek() method. In this blog I’ll discuss two ways of implementing a stack based on the array.

Prometheus Latency Metrics & Exception Logging with Scrutor Decorators

Ever since I stumbled upon the Scrutor project, I wanted to write a blog about building latency and exception logging decorators. At Wehkamp we used StructureMap in the past, but as it became obsolete and swapped out, I missed the decorators. What I love about Scrutor is how it is an extension on the way […]

Reading 400k+ key/values from Redis fast

At Wehkamp we use Redis a lot. It is fast, available and implemented as a managed AWS service called ElastiCache. Sometimes we need to extract data from Redis, and usually I use the redis-cli to interact from the command-line. But what if you need to get the values of 400k+ keys? What would you do? Is there an effective way to query multiple key/values from Redis?

Dependency Injection based on request headers

Dependency Injection (DI) helps us to change the behavior of parts of our program on the fly. This is especially neat when you want to test your domain services against a mocked data-store. But what if you need to change the behavior of your API based on a request header?

Yesterday I had a discussion with my colleague Robert Kranenburg about this. He showed an example of a console application changing its behavior based on an argument. I took the idea and converted it into .NET Core 3.1 code to change behavior based on a cookie.

Cropping model images using PIL

Let’s see if we can use PIL to crop model images and resize them to a 2:3 ratio using Python Image Library (PIL). When all images on an overview are the same ratio, the overview looks way nicer. And… let’s try to make the model on the image, the center of the image.

Plotting a grid of PIL images in Jupyter

When working with images in a Python notebook I like to visualize them on a grid. Just calling display is not enough as it renders the images underneath each other. Let’s use Matplotlib to generate a single image with an image grid on it.

Incorporate free ngrok in your Node.js application for local development

I’ve tried to use the ngrok npm package in my application, but as the documentation says: “The ngrok and all tunnels will be killed when node process is done.” I need the process to “survive” my application. Let’s see what we can do about that…

“Is One Of” and “Is Not One Of” validation attributes

I love attribute validation! They can be used for a myriad of things. In .NET Core MVC we use them to validate models that come into our controllers. In one of our projects we kept running into the same thing: we need to validate a value against an array of pre-defined values. So we wrote some base validation attributes.

Visual Studio Code + Docker + Python using WSL in Windows on Boot Camp

I imagine your first thought is: why? Well, at Wehkamp we do a lot of cross platform development, but sometimes we end up with shell scripts that do stuff with Docker and Python. Usually that’s not a problem for Mac, but for Windows it’s a different thing. I have a MacBook Pro, but I’m a .NET developer, that’s why I prefer Windows, so I run Bootcamp. This article will show how to do Python development in the Windows Subsystem for Linux (WSL) using Visual Studio Code and Docker.