John Ruble on Atomic Spin

Android Emulator on CircleCI’s MacOS Executor

The Android Emulator doesn't work in CircleCI's Docker environment. Here's how we made it work in another.

Web Apps

Sharing TypeScript Code Between Web and React Native

The frontend of our hybrid mobile app will run out of a webview, the backend on-device in React Native. So how do we share code between our existing monorepo built with webpack and

TypeScript

Ergonomic TypeScript Generics with Higher-Order Functions

It can be difficult to design generic functions that are easy to use. Higher-order functions can help you keep unnecessary type parameters out of the way.

Development Practices

Document Your Project’s package.json File

It's a bummer that you can't comment JSON, but that shouldn't stop you from documenting the decisions in your package.json file.

Development Practices

Organize One-Off Task Files with Dated Work Directories

Everyday developer tasks generate a lot of files. Here's an easy way to keep yours organized, and a shell function to help.

Developer Tools

Replacing Heroku Review Apps on Non-GitHub Projects

Heroku's Review Apps are great if you happen to be using GitHub. We're not. Here's the process and infrastructure our team uses instead.

Web Apps

Collection Operations on Lazy Sequences in TypeScript with itiriri

I was disappointed to learn that JavaScript can't map() over the output of a Generator Function. Here's a cool library that can.

Web Apps

Getting Started with AWS Lambda in F#

F# is supported as a first-class language on AWS Lambda. Here’s how to create the resources with AWS CLI, and build and deploy a project with DotNET CLI.

Extracurricular Activities

Fixing the External Monitor Color Problem with My 2018 MacBook Pro

Connect a 2018 MacBook Pro to an unsupported monitor, and the YPbPr/YCbCr color mode can cause poor display performance. I found a way to fix it by overriding the EDID back to RGB

Web Apps

Creating Azure WebJobs in F#

Visual Studio doesn't currently offer a template for them, but it's totally possible to create WebJobs in F#. Here's how!

Functional Programming

Folding Away Mutations in F#

F#'s immutability led me to solve a problem in a more functional way, using fold to apply a series of mutations.

Developer Tools

Headless Chrome with Testem on VSTS-Hosted Agents

With Chrome in CI, our builds are faster and more reliable, and we’re able to raise our target language level, which had been held back for PhantomJS.

John Ruble

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