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Jimmy Royer

Jimmy Royer's Public Library

Aug 25, 16

"There are many compile-to-Javascript languages in the world: virtually every widely-used language has a compile-to-Javascript version of some level of quality (Google Web Toolkit, PyJS, Opal Ruby, ...), and then there are those languages that were designed specifically with Javascript as a target (Coffeescript, TypeScript, ...). Scala.js is one of them, probably one of the most robust and production-ready of the compile-to-JS languages. Over the last three years I have played a large role investing time and effort evangelizing Scala.js and building out the ecosystem and community to what it is today.

However, Scala.js was not always the solid, production-ready platform that it is today. When I first got involved, it was a sketchy new project with so many bugs and problems that using it for a "real world" use case would have been unheard of. While I have spent considerable time giving talks telling people why "Scala.js is good", I have never talked about the core reasons why I started working on Scala.js long-before it was "good" by any measure. Why Scala.js, and not one of the many alternatives? This post will tell that story.

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Aug 25, 16

"Google Analytics tells you what, Inspectlet tells you why"

Aug 19, 16

"Conscript is a distribution mechanism for Scala apps using Github and Maven repositories as the infrastructure. You can use it to install and update apps similar to APT or Home Brew.

It does less than you think, because the sbt launcher does more than you think. More on that later."

Aug 18, 16

Very nice cheatsheet of git that display via graphics in which area a git command executes.

Aug 17, 16

"This little play module provides some syntactic sugar that allows boilerplate-free Actions using for-comprehensions."

This is exactly what I want to write support for in our Scala / Spring Boot application, so it would be a bit different from this version as we do not deal with async Future data type.

Aug 17, 16

A collection of all libraries written in Scala, parsed from github, maven central, etc...

Jul 18, 16

"PubSub (short for publish/subscribe) is a derivative of one of the most analyzed architectural styles in software: event-based integration (EBI). From a purely theoretical perspective, event-based integration is a natural fit for systems that monitor real-time activities, particularly when the number of event sources outnumber the recipients of event notifications (e.g, graphical user interfaces and process control systems). However, EBI does not scale well when the number of recipients greatly outnumbers the sources. Researchers have been studying Internet-scale event notification systems for over two decades. Several derivative styles have been proposed to help reduce the issue of scale, including PubSub, EventBus, and flood distribution. There are probably others that I have left out, but they usually boil down into the use of event brokers (intermediaries) and/or a shared data stream (multicast and flood).

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Jul 11, 16

"One of the main problems is HUGE amounts of js files being downloaded to the user's computer. A great way to avoid this is to only download the minimum the user needs and dynamically load more resources in the background, or as the user runs into pages which require a specific feature.

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Jul 10, 16

"The topic of this article, the singular value decomposition, is one that should be a part of the standard mathematics undergraduate curriculum but all too often slips between the cracks. Besides being rather intuitive, these decompositions are incredibly useful. For instance, Netflix, the online movie rental company, is currently offering a $1 million prize for anyone who can improve the accuracy of its movie recommendation system by 10%. Surprisingly, this seemingly modest problem turns out to be quite challenging, and the groups involved are now using rather sophisticated techniques. At the heart of all of them is the singular value decomposition.

A singular value decomposition provides a convenient way for breaking a matrix, which perhaps contains some data we are interested in, into simpler, meaningful pieces. In this article, we will offer a geometric explanation of singular value decompositions and look at some of the applications of them."

Jul 05, 16

"Custom properties on nt:file and nt:folder nodes

One really nice feature of JCR repositories is that you can use them to store files and folders. Like with all other content, the structure of these nodes is dictated by their node types, and most people use the “nt:file” and “nt:folder” node types defined in the JCR specification. Learning to use these node types can take a little work, because they’re not quite as straightforward as you might expect."

Jul 05, 16

"One really nice feature of JCR repositories is that you can use them to store files and folders. And because it is such a common pattern, the JCR specification defines several built-in node types that can be used to do just this:

nt:folder - The node type used to represent folder-type nodes
nt:file - The node type used to represent files.
nt:hierarchyNode - An abstract node type that serves as the base type of nt:file and nt:folder
nt:resource - The node that used to represent the content of the file
nt:linkedFile - Similar to nt:file, except that the content is not stored under the file node but instead is a reference to the content stored elsewhere."

Jul 02, 16

"Nightweb is an app for Android devices and PCs that connects you to an anonymous, peer-to-peer social network. It is written in Clojure and uses I2P and BitTorrent on the backend. Please see the website for a general overview, and the protocol page for a more in-depth explanation of how it works.

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Jul 02, 16

"I2P is an anonymous network, exposing a simple layer that applications can use to anonymously and securely send messages to each other. The network itself is strictly message based (a la IP), but there is a library available to allow reliable streaming communication on top of it (a la TCP). All communication is end to end encrypted (in total there are four layers of encryption used when sending a message), and even the end points ("destinations") are cryptographic identifiers (essentially a pair of public keys)."

Jul 02, 16

A Tutorial on Principal Component Analysis (PCA & Singular Value Decomposition)

Jun 20, 16

"Three years ago, Docker made an esoteric Linux kernel technology called containerization simple and accessible to everyone.  Today, we are doing the same for container orchestration.

Container orchestration is what is needed to transition from deploying containers individually on a single host, to deploying complex multi-container apps on many machines. It requires a distributed platform, independent from infrastructure, that stays online through the entire lifetime of your application, surviving hardware failure and software updates. Orchestration is at the same stage today as containerization was 3 years ago.  There are two options: either you need an army of technology experts to cobble together a complex ad hoc system, or you have to rely on a company with a lot of experts to take care of everything for you as long as you buy all hardware, services, support, software from them. There is a word for that, it’s called lock-in.

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Jun 20, 16

"Building and training your first TensorFlow graph from the ground up.

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Jun 20, 16

"A correlation matrix is used to investigate the dependence between multiple variables at the same time. The result is a table containing the correlation coefficients between each variable and the others.

There are different methods for correlation analysis : Pearson parametric correlation test, Spearman and Kendall rank-based correlation analysis. These methods are discussed in the next sections.

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