Dan Wahlin

Docker for Web Developers – Now with Kubernetes!

This entry was posted in Docker kubernetes and tagged course training video on by

Over the past year I’ve done several big updates to my Docker for Web Developers course on Pluralsight that I wanted to mention. First, all of the code samples have been updated and Docker Desktop (formerly called Community Edition) is now covered in addition to Docker Toolbox. The biggest update came when I added a new module into the course titled “Moving to Kubernetes”. This module provides an overview of Kubernetes and what it is (a very exciting technology!), examples of using key Kubernetes commands, and an example of moving the Docker Compose orchestrated application shown in the course to […]

Data-Oriented vs. Control-Oriented Programming

This entry was posted in javascript TypeScript and tagged data binding spas on by

I recently had someone ask me a question on Twitter about moving to Single Page Application frameworks and why they’d do that over choosing vanilla JavaScript or jQuery. It’s a great question but tough to question on Twitter with the limited amount of characters. So, I thought I’d dust off an old post I wrote many years ago to address the subject. I also wrote a post titled Choosing the “Right” JavaScript Library/Framework for Your Application that has some additional ideas to consider as well. Any type of front-end app can be built using vanilla JavaScript, jQuery, or a Single […]

4 kubectl Commands to Help Debug Pod Issues in Kubernetes

This entry was posted in Docker kubernetes and tagged commands containers debug diagnose kubectl pods on by

If you’ve worked with containers a lot you’re probably good at commands like docker logs and docker exec to retrieve information about containers that may be having problems. One of the challenges that comes up as people move to Kubernetes is understanding how to get similar details about Pods and any containers running within them. I’ve had several people ask me about this recently in my instructor-led Kubernetes course as well as online with my Docker for Web Developers course (which has a module on Kubernetes) so I decided to post a few of the initial commands you can use […]

Using the Iterator Pattern in JavaScript

This entry was posted in javascript TypeScript and tagged iterator patterns on by

I recently had to parse some markdown using the marked npm package and convert it into JSON objects for a project I’m working on. When I parsed the markdown I’d get back an array of tokens that would look something like the following: I started out the “normal” way by doing a for…of loop to iterate through the tokens in the array. This worked, but tracking the start and end of a token meant adding extra variables which ultimately complicated the code. For example, how do you know if you’re in a list? You track it with an inList variable […]

Docker Volumes and “print working directory” Command Syntax

This entry was posted in Docker on by

I often use Docker to run an application in a container as I’m writing and testing code. That involves creating a volume that points the container to a path on my machine. The challenge with setting up volumes is that the “print working directory” command that is often used to easily identify the location of your source code on the host machine is different depending on what command terminal you’re using (especially on Windows). Here’s a quick summary that shows the syntax for “print working directory” in different command terminals when using volumes (if you’re new to volumes you can read […]

Simplifying Front-End State Management with Observable Store

This entry was posted in javascript TypeScript and tagged immutable notifications observable rxjs simplicity state management store subscribe on by

I admit it – I think the use of some front-end JavaScript state management patterns has gotten out of control. When you’re spending a significant amount of time writing code (and often a lot of it) to handle application state or relying on a scaffolding tool that generates 100s or even 1000s of lines of code then it’s time to take a step back and ask, “Do I really need all of this?”. While you’re at it you might also ask, “What can I do to simplify my code and bring some sanity back to it?”. Rather than ranting about […]

CloudSkills Podcast Interview: Docker, Kubernetes, and Microservices

This entry was posted in Containers Docker kubernetes microservices and tagged containers docker kubernetes microservices podcast on by

I recently chatted with my friend Mike Pfieffer who runs the CloudSkills.fm podcast about Docker, Kubernetes, and Microservices. Mike works a lot in the DevOps space and I work in the developer space (and do some DevOps as well) so it was a fun discussion about challenges that come up in both worlds. We discussed the benefits of containers, the role of Kubernetes, and how both can play an important role when working with Microservices. Listen to the podcast here: CloudSkills.fm Website Video of the Podcast 

New Pluralsight Course: Angular Architecture and Best Practices

This entry was posted in Angular Architecture Databinding Node.js TypeScript VSCode and tagged Ajax angular Architecture Best Practices HTTP Logging rxjs Security Subjects TypeScript on by

I’m excited to announce the release of my next course on Pluralsight titled Angular Architecture and Best Practices! The goal of this course is to provide you with solid, proven guidance to plan out your Angular application architecture, address various challenges that typically come up, and ultimately create a more maintainable and flexible application. Here are a few questions this course will help you answer: Is there one “right” way to architect and build an Angular application? Short answer – NO! What are some key concepts I should consider when planning my application architecture? Is there any type of planning […]

Free Interactive Coding Course: Build Your First Angular App

This entry was posted in Angular CSS Databinding HTML5 javascript Observables RxJS SPA TypeScript and tagged angular development rxjs spas TypeScript web on by

About a year ago I was browsing the web and came across a site called Scrimba.com. It provided a unique way to learn about web technologies through a live code editor combined with audio that syncs with the code – something you have to actually try out to realize the full potential. Since I do a lot of training for companies the Scrimba tool really caught my eye. I was so impressed with the features Scrimba provided that I decided to contact the creators (Per Harald Borgen and Sindre Aarsaether) to let them know that I thought the tool they had […]

Real Talk JavaScript Podcast: End to End Testing with Cypress.io

This entry was posted in Angular cypress.io end-to-end-testing javascript SPA TypeScript Uncategorized and tagged cypress.io end-to-end-testing podcast realtalkjs testing on by

I had the opportunity to talk with my good friends John Papa and Ward Bell about Cypress.io and end to end testing on the Real Talk JavaScript podcast.  We talked about why I think end to end testing should get more attention, how I’m using it in a current project, as well as the benefits it can offer developers. I wasn’t a huge fan of end to end testing in the past mainly because I hadn’t used it much on projects, had the misconception that it was for “dedicated testers”, and felt like it would require a lot of time […]