React is known for its performance by using the Virtual DOM (VDOM). It only triggers an update for the parts of the real DOM that have changed. In my opinion, it is important to know when React triggers a re-rendering of a component to be able to debug performance issues and develop fast and efficient components.
After reading this article, you should have a good understanding of how React rendering mechanism is working and how you can debug re-rendering issues.
First, we need to understand what rendering in the context of a web application means.
Domain names provide a human-readable address for any web server available on the Internet and are a key part of the Internet infrastructure. You can reach any computer which is connected to the Internet through a public IP address. This IP can either be an IPv6 address (e.g.
2001:0DB8:0000:0001:0000:0000:0010:01FF), or an IPv4 address (e.g.
This article summarizes a list of Angular interview questions which I would ask candidates and that I get often asked in interviews.
Angular is an application design framework and development platform for creating efficient and sophisticated single-page apps. Angular is built entirely in TypeScript and uses it as a primary language. As it is a framework it has many useful built-in features like routing, forms, HTTP client, Internationalization (i18n), animations, and many more.
For me, it is important to see analytics about my portfolio website. This way, I can see which posts got the most views, which country my users are from, and which browser & operating system they are using. The simplest solution to add analytics to your site is Google Analytics as it is free and easy to set up. But as we all know, this service is only free as we pay it indirectly by providing data to it. What you need to know about Google Analytics and privacy.
It is important to monitor an application’s metrics and health which helps us to improve performance, manage the app in a better way, and notice unoptimized behavior. Monitoring each service is important to be able to maintain a system that consists of many microservices.
In this blog post, I will demonstrate how a Spring Boot web application can be monitored using Micrometer which exposes metrics from our application, Prometheus which stores the metric data, and Grafana to visualize the data in graphs.
Implementing these tools can be done quite easily by adding just a few configurations. …
Creating a changelog is a usual task if a new software version is going to be released. It contains all the changes which were made since the last release and is helpful to remember what has changed in the code and to be able to inform the users of our code.
In many projects, creating the changelog is a manual process that is often undesired, error-prone, and time-consuming. This article describes some tools that can help to automate the changelog creation based on the Git history.
Let’s start with some basics.
Semantic Versioning (SemVer) is a de facto standard for…
On Hacker News I discovered the article Building a self-updating profile README for GitHub. I was very fascinated about this new GitHub feature and wanted to build something similar for my GitHub profile.
GitHub profile READMEs are a new feature that allows users to have the content of a README markdown file rendered at the profile page.
To use this feature you just need to create a new repository that has the same name as your GitHub account. Mine is located at
github.com/mokkapps/mokkapps.This repository needs to be public and initialized with a README:
In my current project my colleague Michael Seifert introduced property based testing in our Python codebase. It was the first time I heard about it and it sounded fascinating, so I wanted to also implement it in our frontend code based on Vue.js with Jest as testing framework and TypeScript as programming language.
TL;DR: A single concrete example of expected behavior of the system under test.
If you are developing the backend and frontend part of an application you know that it can be tricky to keep the data models between the backend & frontend code in sync. Luckily, we can use generators that generate server stubs, models, configuration and more based on a OpenAPI specification.
For this article, I have created a simple demo application that provides a backend REST endpoint based on Spring Boot that returns…
In my current, I had the opportunity to develop a new application based on Vue.js in the frontend and Spring Boot in the backend. The backend should send updates to the frontend via a WebSocket connection so that users do not need to refresh the website to see the latest information.
The view should show a list of transfers where the user can modify the results by using filters and pagination. As a requirement, each user should receive specific results based on his filters and pagination without broadcasting this to all other connected users. …
Freelance software engineer from Germany with focus on Angular