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JavaScript is perhaps the most highly regarded of the different programming languages out there, and in terms of client-side programming languages, there are few tools that are peers to JavaScript. In terms of web development, it is clear that JavaScript has a very important role ...

When it comes to expanding what you do and being more valuable to potential employers, programming is a great way to get yourself greater value on the job market. Programming is a valuable skill. There are a lot of people who do a lot of things with computers, but at the same tim ...

This article explains how to manage video content with HTML and JavaScript. Video content has become a significant part of Internet use, and it plays a large role in user experience. The ability to effectively include video content in your sites can help you improve user experien ...

Fix “X can’t be opened because Apple cannot check for malicious software” and “Developer or app can’t be verified” using the command line. Mac OS X Catalina has introduced a new host of permission issues. There are workarounds for applications ...

This post explains how to fix “[Vue warn]: You are using the runtime-only build of Vue where the template compiler is not available. Either pre-compile the templates into render functions, or use the compiler-included build.“. This error happens when using the Vue CLI ...

Between test runs we need mocked/spied on imports and functions to be reset so that assertions don’t fail due to stale calls (from a previous test). This is a way to mitigate what little statefulness is in the system. In unit tests of complex systems, it’s not always ...

Where other JavaScript testing libraries would lean on a specific stub/spy library like Sinon - Standalone test spies, stubs and mocks for JavaScript. Works with any unit testing framework., Jest comes with stubs, mocks and spies out of the box. This post looks at how to instanti ...

It’s possible to do partial matches on Arrays and Objects in Jest using expect.objectContaining and expect.arrayContaining. expect has some powerful matcher methods to do things like the above partial matches. Using Jest at an advanced level means using tools like these to ...

When testing code with Jest, it can sometimes be useful to fail a test arbitrarily. This post goes through a few scenarios where that might be useful and how to fail a Jest test explicitly/in a forced manner. It also presents more idiomatic Jest patterns that could be used interc ...

There are occasions when running a Python/Ruby/PHP shell script from Node.js is necessary. This post looks at best practices around leveraging child_process.spawn and child_process.exec to encapsulate this call in Node.js/JavaScript. The goal here is to have an interoperability l ...