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Visual Studio Code (VS Code) is a free, cross-platform, and lightweight source-code editor developed by Microsoft for Windows, Linux, and Mac operating systems. It is a source-code editor while Visual Studio is an IDE (integrated development environment). VS Code supports development operations such as debugging, task running, and version control, like Visual Studio.
In this blog, we will learn about developing, debugging, testing, and deploying ASP.NET Core applications using Visual Studio Code.
The following packages should be installed in your machine:
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We’ve heard from many educators that the first days or weeks of the semester can be lost to configuring the correct environment for students. Even so, students may still end up with a low-quality development experience or insufficient grading of their assignments:
“Set up for my students normally takes five class periods. There are version of Python to deal with. There’s a lot of complexity. Sadly that complexity takes a lot of time and money to sort out.” -[Community College US Professor CS 101]
“I would prefer a version of VS Code, specifically set up for a Python installation…” -[Assistant Professor, Liberal Arts College]
Development containers with Visual Studio Code can serve as a fantastic tool in education to ensure students have a consistent coding environment. They take care of setup so that students and instructors can quickly move past configuration, and instead focus on what’s truly important: learning and coding something great!
So, what are development containers? Containers are pieces of software that package code and all of the dependencies that code needs to run, including the runtime, tools, libraries, and settings. Containers were initially created as a way to deploy and manage apps in a consistent environment and make more efficient use of hardware. They later evolved to help in providing a consistent build environment, and more recently, development environment. That’s where the name dev container comes from.
When you create a container, its initial contents come from what’s known as an “image.” An image can be thought of as a mini-disk drive with things like the operating system and other tools pre-installed. You describe what goes into the image using a Dockerfile, and once you run the image, it becomes a container.
Dev containers provide a separate coding environment from your computer. For example, if you download a specific version of a dependency, that version will be unique to the container. In the diagram below, notice how the container includes the app and its necessary dependencies, keeping the computer (Host OS and Infrastructure) free and clean of any dependencies:
As an instructor, you can create a specific image for an assignment. Each student will get the same exact same version of dependencies, such as the same version of Python or a C++ compiler, regardless of their operating system or any other files already installed on their computer.
The Visual Studio Code Remote - Containers extension lets you use a container as your main coding environment. In the classroom, an instructor can take an existing dev container, or create their own, and share it with the class. Each student can open the container in VS Code and automatically have the tools and runtimes they need to develop their applications. Students will also have access to VS Code’s full feature set, including IntelliSense and debugging, while coding.
The Remote – Containers extension works solely with Linux-based containers, so although students may have different operating systems on their computers, the coding environment will be consistent across all of them.
We’ve already seen instructors using Remote – Containers in their classrooms with success. You can check out Using DevContainers to Standardize Student Development Environments: An Experience Report to learn more about the experiences of three researchers who used dev containers in a course at UC San Diego.
This post will serve as a guide to instructors looking to implement development containers in the classroom to create a smoother, more consistent environment for their students.
To witness dev containers in action and how students can get started in just 5 minutes, check out our introductory student video.
With traditional set up approaches, students can run into a wide variety of issues while setting up their environment. Some examples include differences in their unique OS, where project files are stored, or small differences in runtimes or tools they’ve installed. Instructors need to be well versed in all these subtleties to be able to help students solve these issues.
A common issue is managing different versions of a tool. Let’s take Python as an example: there’s Python 2 and Python 3, along with different minor versions. Having multiple versions of Python, and then multiple accompanying tools such as linters, can be confusing and lead to errors.
To save tremendous time and confusion, we can use dev containers to create a standardized Python development environment across our class. Students will all get the same version of Python, avoiding the need to install a new version or uninstall any old ones, and everyone running the same container and source code will get the same exact results.
Let’s start off by launching VS Code, which we can do by typing
code in the command prompt or terminal (or just by selecting VS Code on your computer):
Once VS Code launches, ensure you’ve installed the Remote - Containers extension:
When we install any of the Remote extensions, the green Remote indicator is added to the bottom left of the Status bar:
You can click on it to open the Command Palette and verify the Remote-Containers commands are listed:
Let’s walk through an example dev container to help students get a consistent coding environment. In our classroom, we could create a single GitHub repository to store exercises that share the same tech stack. For instance, all the Python assignments can use the same container and be stored in the same repo.
We have an example vscode-course-sample GitHub repo with a Python dev container and two Python intro assignments. Let’s open it in VS Code.
You can select the Remote indicator in the bottom left, or use the Command Palette, to bring up the Remote-Containers commands.
Let’s call Open Repository in Container…
We need to enter the URL to the GitHub repo where our container is stored, which in our case is microsoft/vscode-course-sample:
You can Create a unique volume. A volume is where files will be stored in our container:
Now that we’ve chosen our container repo, VS Code reloads to build the image and start the container:
Once the container is built and running, our files are loaded and we can start coding within our Python environment!
sort.py in the Explorer to open it, and press F5 (or the green Run icon in the top right) to run it:
Our Python code ran successfully without ever having to set up Python on our local computer.
We also have access to all the benefits of VS Code, such as setting breakpoints to pause our program and help us debug. Let’s set a breakpoint when we sort our list of words.
We can run our program with F5. Notice that the program stops once it hits the breakpoint:
Now that we’ve seen a fantastic example of a container, let’s set up our first container ourselves using the Remote – Containers extension. Let’s start off in a “Hello World” Python application:
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If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?
In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.
Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.
Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.
The popularity of React Native comes from its advantages. Some of its advantages are as follows:
Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.
React Native is very close to native. Consider the following aspects as described on the React Native website:
Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.
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