Ruby on Rails Tutorial

Newly updated for Rails 5, the Ruby on Rails Tutorial book and screencast series teach you how to develop and deploy real, industrial-strength web applications with Ruby on Rails, the open-source web framework that powers top websites such as Twitter, Hulu, GitHub, and the Yellow Pages. The Ruby on Rails Tutorial book is available for free online and is available for purchase as an ebook (PDF, EPUB, and MOBI formats). The companion screencast series (currently in preparation) includes 14 individual lessons, one for each chapter of the Ruby on Rails Tutorial book.


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After New GIMP Release, Core Developer Discusses Future of GIMP and GEGL

GIMP 2.9.4 was released earlier this month, featuring “symmetry painting” and the ability to remove holes when selecting a region, as well as improvements to many of its other graphics-editing tools. But today core developer Jehan Pages discussed the vision for GIMP’s future, writing that the Generic Graphics (GEGL) programming library “is a hell of a cool project and I think it could be the future of Free and Open Source image processing”:
I want to imagine a future where most big graphics programs integrate GEGL, where Blender for instance would have GEGL as the new implementation of nodes, with image processing graphs which can be exchanged between programs, where darktable would share buffers with GIMP so that images can be edited in one program and updated in real time in the other, and so on. Well of course the short/mid-term improvements will be non-destructive editing with live preview on high


Original URL: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/G5Iq8IKY6BM/after-new-gimp-release-core-developer-discusses-future-of-gimp-and-gegl

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Learn Coding Skills for the Raspberry Pi and Minecraft With This Free Book

There are few things that go together better than Minecraft and the Raspberry Pi, and the little microcomputer meant to teach kids coding can do even more with Minecraft. The folks at MagPi, the official magazine of the Raspberry Pi Foundation, have a free PDF that teaches you everything you need to know.Read more…


Original URL: http://feeds.gawker.com/~r/lifehacker/full/~3/2zDpRuMW2Ac/learn-all-kind-of-coding-skills-using-a-raspberry-pi-an-1784535192

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Building a browser-based test automation server on the Google Cloud Platform

Building a browser-based test automation server on the Google Cloud Platform by using SeleniumBase

(This tutorial, from a previous GCP Meetup live demo, will teach you how to setup a Linux server for running automated browser tests. The cost of running this server is $14.20/month on Google Cloud (enough to handle 6 parallel tests). This is amazingly 20 times LESS expensive than using competitors such as BrowserStack or Sauce Labs for the SAME number of parallel tests.)

Step 1. Open the Google Cloud Platform Cloud Launcher

Step 2. Launch a Jenkins instance

Under “Cloud Launcher”, Click on “Jenkins”
Click on “Launch on Compute Engine”
Give the instance a name
Give the instance a zone
Click “Create”
Step 3. Connect with your new Jenkins instance

SSH into your new instance by selecting: “SSH” => “Open in browser window” from the instance page.
Step 4. Clone the SeleniumBase repository from the root (“/”) directory.

cd /
sudo git clone https://github.com/seleniumbase/SeleniumBase.git

Step 5. Enter the “linux” folder

cd


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Elsevier – My part in its downfall

Article note: article is from 2012. issues with Elsevier and access to academic publishing are not new and aren’t really getting better.The Dutch publisher Elsevier publishes many of the world’s best known mathematics journals, including Advances in Mathematics, Comptes Rendus, Discrete Mathematics, The European Journal of Combinatorics, Historia Mathematica, Journal of Algebra, Journal of Approximation Theory, Journal of Combinatorics Series A, Journal of Functional Analysis, Journal of Geometry and Physics, Journal of Mathematical Analysis and Applications, Journal of Number Theory, Topology, and Topology and its Applications. For many years, it has also been heavily criticized for its business practices. Let me briefly summarize these criticisms.
1. It charges very high prices — so far above the average that it seems quite extraordinary that they can get away with it.
2. One method that they have for getting away with it is a practice known as “bundling”, where instead of giving libraries the


Original URL: http://feedproxy.google.com/~r/feedsapi/BwPx/~3/28ZuB_x1iOQ/

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Hidden Text Editor in Chrome Developer Tools

Google Chrome developer Tools has a code snippets feature that allows you to quickly write, test, save and re-use code snippets.

One way to test JavaScript code is to type it into Chrome Developer Tools console and hit enter. It will cause whatever you typed in to execute immediately. If you hit “Shift + Enter” instead, the cursor would move to a next line to allow you to enter code across multiple lines. The code will execute when you finally hit enter.
This is great for testing small functions, but I personally find it pretty annoying and hard to use for anything longer than 3 lines of code.
Thankfully, Google Chrome has code Snippet feature which solves this problem.
Creating a code snippet
Code snippets is a special view that shows up in your Chrome developer tools. You can:
Open the Developer Tools
Navigate to Sources at the top menu
Select Snippets in the left menu (see


Original URL: http://feedproxy.google.com/~r/feedsapi/BwPx/~3/uUAWnvKxZgQ/

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GIMP 2.9.4 and our vision for GIMP future

So you may have heard the news: we recently released a new development version of GIMP, version 2.9.4 (as well as a bugfix release 2.8.18, but this is not as awesome).
GIMP 2.9.4
I am not going to rewrite all of the official news, because you may as well read it on gimp.org. Anyway I co-wrote the news with the rest of the team and provided several screenshots. So reading there is also partly same as reading here.


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