Type-Safe Object Merging (TypeScript 2.8 Edition)
There are times when you want to merge two generic types in TypeScript, and type inference just isn’t doing it for you. Object.assign’s typing isn’t as precise as it could be, and spreading generics still doesn’t work. I’ve found a way to implement typing when merging objects using some of the new features in TypeScript 2.8. A Sample Problem Let’s start by defining some types we can use as example
A New Redux Action Pattern for TypeScript 2.4+
In September 2016, I wrote a post about a pattern for strongly typed Redux reducers in TypeScript. Since then, the TypeScript team has been busy enhancing the language, and recent changes in TypeScript have enabled a much more natural, boilerplate-free pattern for strongly typed actions and reducers in TypeScript. Our motivating example is to be able to write reducers like this: This reducer is fo
From Ruby to Crystal: A Quick Look
In my dabbles into game development, I’ve loved the expressiveness of Ruby, but longed for the performance of a compiled language. (Anyone else in that boat?) I recently heard about a newer language that promised “The beauty of Ruby with the speed of C.” Its name is Crystal. Crystal has been around since 2013 and made its first official release in 2014. Its standard library is quite complete and w
Run a Local Rails Script on Heroku
Heroku provides a convenient command line interface for executing snippets of Ruby code remotely. One-liners can easily be piped into the heroku run console command. But what about much longer scripts that you write locally and want to execute in a remote Heroku environment? In this post, I’ll show you how to execute a long Ruby/Rails script in a remote Heroku environment. One-Liner The run consol
Comparing Node.js Debug Options
I’ve been doing a lot of Node.js development lately. I wanted to get a better understanding of the debug options available for Node apps, so I thought I would do some investigation and summarize what I found. Option 1: The Built-In Debugger If you’ve done any Node development, you’re probably familiar with the built-in Node debugger. It supports placing debugger statements in your source code. Whe
Elixir Native Interoperability – Ports vs. NIFs
Lately I’ve been working on a personal project of creating a wireless sensor network across my home. Elixir is a perfect fit for this project, but I quickly hit a road block: serial device access. While there are Erlang serial libraries that I could use, I wasn’t ultimately comfortable doing so, due to many forks and adding yet another layer of complexity. The Erlang VM, which Elixir runs on top o
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