The Glimmer VM: Boots Fast and Stays Fast
Great web applications boot up fast and stay silky smooth once they've started. In other contexts, applications can choose quick loading or responsiveness once they've loaded. Great games can get away with a long loading bar as long as they react instantly once the gamer gets going. In contrast, scripting languages like Ruby, Python or Bash optimize for instant boot, but run their programs more sl
Understanding JavaScript Function Invocation and "this"
Over the years, I've seen a lot of confusion about JavaScript function invocation. In particular, a lot of people have complained that the semantics of this in function invocations is confusing. In my opinion, a lot of this confusion is cleared up by understanding the core function invocation primitive, and then looking at all other ways of invoking a function as sugar on top of that primitive. In
Using Bundler in Real Life
A lot of people have asked me what the recommended workflows for bundler are. Turns out, they're quite simple. Let's step through a few use-cases. You Get a Repo for the First Time You've just checked out a git (or other) repository for an application that uses bundler. Regardless of any other features of bundler in use, just run: bundle install This will resolve all dependencies and install the o
Gem Versioning and Bundler: Doing it Right
Recently, an upgrade to Rake (from version 0.8.7 to version 0.9.0) has re-raised the issue of dependencies and versioning in the Ruby community. I wanted to take the opportunity to reiterate some of the things I talked about back when working on Bundler 1.0. First, I'll lay out some basic rules for the road, and then go into some detail about the rationale. Basic Versioning Rules for Apps After bu
clarifying-the-roles-of-the-gemspec-and-gemfile
TL;DR Although apps and gems look like they share the concept of "dependency", there are some important differences between them. Gems depend on a name and version range, and intentionally don't care about where exactly the dependencies come from. Apps have more controlled deployments, and need a guarantee that the exact same code is used on all machines (dev, ci and production). When developing a
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