Recently I had to test some of my Python 🐍 🐍 🐍 code which required an external dependency and communicating by using TCP sockets 🔌 . You can think of this dependency as essentially a database because it stored information. However, when testing my Python code, I couldn’t rely on there always being a TCP server to send messages to. So I ended up creating a simplified mocked version in Python. ...
Running Expo/React Native in a Docker container can sometimes cause issues. In this example, I will be running Docker 🐳 within a guest VM (Ubuntu) which will run on my host machine (Windows). My host machine will also be running another VM as the Android emulator (Genymotion) for Expo to connect to. You can get a more detailed post about how to connect two VMs together here, #Plug 🔌🔌🔌. Since I’ve set up networking on those two VMs already as far as Expo is concerned it might as well be running on the host machine (Windows). ...
The core logic of my React Native app involves using WebViews because I need to access the HTML5 canvas. Whilst developing this code there are bound to be errors and issues with the WebView code. Figuring out how to debug code within the WebView isn’t so obvious. Option 1: Chrome Inspect Start your Expo/React Native app*. Open and chrome and then go to the following URL, chrome://inspect. Then click on the inspect button, click the top link to open the latest WebView, you should see something similar to Figure 2. ...
SQLAlchemy is an Object-relational mapping (ORM) made for the Python programming language. ORMs in theory allow programmers to abstract away SQL. In simple terms they allow us to interact with a database using purely Python (objects/functions). I will be using the flask-SQLAlchemy extension for my examples. Each table is referred to as a model, each model is simply just a python class and each attribute of that class becomes a column in an SQL table. ...
Visual Studio Code and WebStorm are two popular editors for developing React Native/Expo apps. These editors have lots of useful features, such as syntax highlighting, git integration and auto completion. However working out to debug Expo apps can be a bit confusing. One of the main advantages of working in an editor/IDE (let us be honest Visual Studio Code is pretty close to an IDE) is being able to use a debugger (and breakpoints) to go through your code line by line and see which part of your code is not running as expected. ...
My home PC runs Windows for various conveniences, such as gaming. However, for development, I run an Ubuntu virtual machine (VM) and Genymotion (on Windows) for testing my app. Genymotion also uses VirtualBox to run its Android emulators. So we work out how to let two VMs running on the same host communicate with each other (Ubuntu and Android Emulator). Please Note: This will also work for VMWare Player. Solution There are a few networking options we can choose from when setting up a VM. ...