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Writing unit tests for asynchronous non-deterministic code can be tricky. How do you go about testing functions that make use of network calls or read from/write to the filesystem? Mocking libraries like testdouble or sinon can help. But what about testing these sorts of scenarios that make use of Node’s event loop? Consider the following example:

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One of the most powerful yet complex constructs of the Go programming language is that of interfaces. An interface in Go allows for flexibility in design and implementation of functions through polymorphism. If you are coming from Java or another statically typed object-oriented language, then these are concepts that you are most likely already familiar with. However, the implementation of interfaces in Go is implicit, rather than explicit. Consider the following example:

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The gap between development and production/deployment has long been narrowing. There is a growing need for developers to understand and master not just the development lifecycle of software, but also the deployment and maintenance of that software. Production environments can be notoriously difficult to maintain: compatibilities and dependencies must be carefully planned for when moving from a development environment to a production environment. What if there was a way to just create one environment — one time — and deploy that environment to production? This is exactly the problem that Docker aims to solve.

If you are unfamiliar with how…

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Often when building web apps, we are writing asynchronous code — making a network request to an external API, for example. Data retrieved from a network request takes time to come back — the request must be sent to the server, the server executes code to form the response, and the data is then transferred back over the network to complete the request. We cannot access data that has not yet been resolved by the request in a synchronous manner. Consider the following example, which for our purposes simulates a network request:

function getUsers() {
return new Promise(resolve =>…

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Rails version 6 is out! One of the most exciting things about the newest release of Rails is the treatment of JavaScript as a first-class citizen. Webpacker is now bundled by default with every new project bootstrapped with the Rails CLI, along with support for using Angular, React or Vue. I personally am a big fan of React, and wanted to test how easy it would be to setup a new Rails project with support for React right out of the box. Let’s get started building a simple app!

First, you’ll want to make sure you update to Rails 6…

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The process of setting up a project for deployment doesn’t have to be a pain. If you are preparing and scaling for production throughout the development phase, pushing your final app out into the world can be simplified and streamlined. Build tools and testing frameworks can help make this process smooth and painless, and pushing your code regularly to a production build can alleviate a lot of pain points. Travis CI is a popular CI/CD tool which is free for use with open source projects. …

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When I began thinking about how I’d like to build and structure a personal portfolio site, I looked into a number of options. Should I create a site with Squarespace or Wix, just to make things quick? Use a template from HTML5 UP? I knew I didn’t want to hand code everything from scratch, as it would be incredibly time consuming and inefficient. And then I heard about GatsbyJS.

I first heard about Gatsby when I went to a workshop at REFACTR.TECH. I was immediately intrigued after learning that Gatsby is a static site generator built on top of React…

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I am of the opinion that programming languages are merely tools in the creative arsenal — and as much as a hammer has a specific purpose, different languages are suited for different tasks. I am personally a big proponent of Ruby as a language to quickly hack and prototype ideas: the language is simple, expressive, and doesn’t require any thought about low level details like typing and garbage collection. I can drop into IRB or Pry in the terminal and play with ideas until I have a working prototype, which I can then quickly throw into a project skeleton that…

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Cloud computing, serverless architecture, microservices … if you have been paying attention to the latest web development trends, you have undoubtedly heard these key terms. What does it mean to move part or all of your development cycle over to the cloud, and what does that look like?

AWS (Amazon Web Services) Lambda is a solution to build microservices using the serverless architecture paradigm. Instead of building out a server from scratch and spending time and resources on hosting and configuration, Lambda provides a function as a service — or FaaS — which allows you to quickly and easily write…

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Whenever I am building out an API, I am constantly testing every endpoint as I go to ensure functionality. Postman is an amazing tool to help with API testing, and its claim to be the “Complete API Development Environment” delivers. In this article we will discuss how to set up a testing environment for any stage of development using environment variables, and how to automate the process of testing using JavaScript within Postman.

For the purposes of this article I am going to use an API that I am currently building out, but you should feel free to use whatever…

Spike Burton


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