Dockerising an XMPP Server

Shaun Taheri wrote “As part of an internal migration of our XMPP server, we thought this would also present a good opportunity to test drive Docker to see if it would be useful for other infrastructure projects in the future. Docker is fast becoming the industry standard for deployment on Linux platforms, and for a number of good…”

Super-simple JavaScript inheritance

Sam Carr wrote “JavaScript uses prototype-based inheritance, which can prove a bit of a puzzler for those of us used to class-based object orientation. At first glance it seems like it’s basically the same and as if it can be used in very nearly the same way. If you pretend that those prototype objects are in fact classes…”


CSS Transitions can’t animate display change

Sam Carr wrote “I’d like to demonstrate a fairly simple CSS issue that caught me out, and the straightforward solution. Put simply CSS Transitions do not work if there is a change in the display property as part of the same change that fires the transition, but you can workaround this by separating out the display change. If…”

By Janos Korom Dr. from Wien, Austria (Requiem in Mariazell (4)) [CC-BY-SA-2.0 (], via Wikimedia Commons

Requiem for the Command pattern

Tim Band wrote “Is there anything sadder than the Command pattern? The exemplar of the once-proud Patterns movement, the one that everyone understands and can see the power of, the one that has an instant applicability to many applications: the undo system. I remember a time when undo seemed a luxury to be implemented only by the most hardened of programmers; then the command pattern made it achievable by any decent coder. Now, the Command pattern is just that extra cruft you have to write when your language doesn't have good support for closures.”


A simple Knockout page router

Sam Carr wrote “Knockout.js is a pleasantly simple approach to data-binding ViewModels into your HTML. Like many JavaScript libraries it sticks to a core mission with a few simple concepts, which makes it quite approachable. Its simple template support means that you don’t need to write much code to get a top-level page router going in your single…”


Two weeks at LShift

Lewis wrote “On a welcome break from studying for my GCSEs at school I spent two weeks doing ‘work experience’ at LShift. At the end of the two week placement I was interrogated by Keith Fisher. Here’s a transcript: 1. Did you have a choice in where to do your work experience placement? Yes I had complete…”

By Alberto-g-rovi (Own work) [CC-BY-SA-3.0 ( or GFDL (], via Wikimedia Commons

When in Rome

David Ireland wrote “I’ve been trying to integrate js-sequence-diagrams into Trac. I’ve reached the point where I can choose between my sequence diagrams getting rendered, and the rest of the Javascript in Trac working. And it’s all because of an underscore… There’s a popular library in the Javascript world: underscore. In python _ is used to internationalize a…”


Getting back into front-end web development

Sam Carr wrote “I’ve been working on a small SPA (Single Page Application) – just HTML, CSS and JavaScript statically served and doing its thing entirely in the browser. I learned a great deal throughout the project, but here are some of the things that strike me as most valuable. Get a good workflow going I used Grunt…”


Two Magnolias, one container

Tim Band wrote “We are using Magnolia in a number of projects here at LShift. I have been feeling that Magnolia has a simple way to do most things, but often there are a number of other plausible alternatives that gradually lead you into wasting enormous amounts of time. Here I want to present a simple way to…”


Predicting and controlling correlations in differentials of addition mod 2^{n}

Paul Crowley wrote “This is a paper I wrote in collaboration with Scott Fluhrer in 2005. It was not accepted for FSE 2006; it would have been better if I hadn’t waited until 2014 to make it public, but better late than never. It arose from a discovery I made when developing attacks on Salsa20 for “Truncated differential…”