JavaScript Development

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Curated list of articles and videos produced by members of App Services that pertain to JavaScript.

App Services

Articles related to JavaScript at App Services.

Our Experience With KafkaJS

In this article, we will present the pros and cons of working with KafkaJS based on our recent body of work with the technology.

Our Experience With NestJS

Our Application Services group has been using NestJS in an ongoing customer engagement. This article goes into the pros and cons of working with NestJS when it comes to development, documentation and testing.

Schnucks Customer Shopping Experience App

World Wide Technology (WWT) developed a customer reward and experience mobile application and program for Schnucks Market, Inc., a third-generation family-owned grocery/pharmacy retailer.

Bluetooth Low Energy Mobile App Development: A Comparison of Kotlin Multiplatform Mobile, React Native, and iOS

Team BLERN, an internal learning team, was formed to develop a mobile application with the ability to communicate with Bluetooth Low Energy (BLE) health devices. Specifically, we were tasked with reading the heart rate and oxygen saturation levels provided by a pulse oximeter and displaying the data within the app.

Fundamentals

Explore fundamental topics that pertain to JavaScript.

What Is CORS (Cross-Origin Resource Sharing)?

Why do I get a CORS error on my website? What does it mean when a client needs us to implement CORS?

The What and Why of Progressive Web Apps

Progressive web apps (PWAs) were supposed to be a silver bullet for cross-platform web development. That idea may still be viable, but it has been and will continue to be quite the bumpy journey.

Implementing Sockets and Making Your Application Real-Time

Making applications real-time is a common problem, even in popular tech stacks. This is a solution to ramp up quickly using Flask-SocketIO in an app that leverages Python server-side with a React client.

TypeScript Records and Mapped Types

Let's take a tour of TypeScript's Record and Mapped Type features by looking at their usage and evolution within a project.

SOLID Principles for Solid Code

Software engineers strive for code that is easy to understand and maintain. SOLID is an acronym used to describe a set of design principles that relate to object-oriented software design. These five principles guide engineers toward effective application architecture that enables future feature development and maintenance. This article will explain SOLID principles using code examples that illustrate how applying the principles leads to more effective software architecture.

Typescript: Beyond the Type Hype

Learn from our expertise with Typescript.

Testing

Articles about testing and the philosophy around it.

Exploring the World of Test Automation

There are many test automation tools on the market - with an avalanche of articles, blogs and videos that recommend or critique them. For companies wishing to improve their software development quality processes, it is difficult to know what choice to make. This article will introduce you to the world of test automation tools, giving you the power to investigate further and make a more qualified choice.

You Don't Have Time to Skip Test Automation

When time is short, you might think that skipping test automation will speed things up. In fact, the opposite will happen. This article explains why.

Using Mock Service Worker to Improve Jest Unit Tests

Mock Service Worker (MSW) improves unit tests of components that make API calls by defining mocks at the network level instead of mocking our own custom code. Better still, we get that benefit while also making our test code smaller, easier to read and easier to reuse.

Using Jest to Run Integration Tests

Jest is a popular unit test framework that can easily be extended to include integration tests. We'll discuss writing an integration framework in a Node environment backed by a MySQL database.

Abstraction: Make Your Test Code More Readable and Repeatable

Learn about abstraction and making repeatable code for your tests. This article will explore why you may want to create "helpers," how to do it and what to expect when you do so.

Best Practices for Writing Tests for React Apps

Learn best practices for writing maintainable and sustainable tests for your React apps.

Proxies

A series of articles exploring JavaScript Proxies and how you can use them.

Exploiting JavaScript Proxies for Fun: Part 1 - Previewing Proxies

Proxies were added to JavaScript in 2015, but still are a rare sight when developing. This article series will take a look at why that might be and some of the fun ways proxies can be used to enhance your code.

Exploiting JavaScript Proxies for Fun: Part 2 - Private (Proxy) Party

Proxies were added to JavaScript in 2015, but still are a rare sight when developing. This article series will take a look at why that might be and some of the fun ways proxies can be used to enhance your code.

Exploiting JavaScript Proxies For Fun: Part 3 - Propagating Props

Proxies were added to JavaScript in 2015, but still are a rare sight when developing. This article series will take a look at why that might be and some of the fun ways proxies can be used to enhance your code.

Exploiting JavaScript Proxies for Fun: Part 4 - Proxied Property Procurement

Proxies were added to JavaScript in 2015, but still are a rare sight when developing. This article series will take a look at why that might be and some of the fun ways proxies can be used to enhance your code.