As a developer you know that situation: the code worked like a charm and suddenly there is a bug but you have no idea where and when it was introduced.
If you are working in a big team the chances may be quite high that many commits have been added in the meantime. So finding the commit where the bug was introduced can become quite nasty.
Luckily, Git offers a tool that helps to detect the first bad commit that introduces the bug. It is called “git bisect”.
We need to provide Git Bisect two information to be able to…
This article summarizes a list of React interview questions that I would ask candidates and that I get often asked in interviews.
It’s the V in the MVC (Model — View -Controller), so it is an open-source UI library rather than a framework.
The twelve-factor app is a known methodology for building software-as-a-service apps. One factor describes that an application’s configuration should be stored in the environment and not in the code to enforce a strict separation of config from code.
There exist many types of configuration data, for example:
Recently I recognized that some SaaS (Software as a Service) products use AWS Amplify which helps them to build serverless full-stack applications. I think serverless computing will be the future of apps and software. Therefore, I wanted to gather some hands-on experience, and I built a serverless application using AWS Amplify that uses React as frontend framework and GraphQL as backend API.
In this article, I want to guide you through the process how to build and deploy such an Amplify application.
AWS Amplify describes itself as:
Fastest, easiest way to build mobile and web apps that scale
I recently joined a project where the team used two separate Git repositories for their web components based on Stencil and Storybook. But the idea of Storybook is that the so-called “stories” live next to the components source code. Therefore, it made no sense to me to have those two tools in different repositories, and I combined them both in one repository.
My goal was that developers can also use Storybook stories via hot reload during development. Additionally, it should still be possible to separately deploy the web components to a npm registry and Storybook to a public URL.
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. …
Freelance software engineer from Germany with focus on Angular and React