When you make a simple TCP connection to a remote server (like telnet), your client won't normally notice when...
Method lookup Understand all the terms in How Ruby method lookup works, in particular: include extend singleton class
We've already learned how to integrate user-provided images uploads to our application in 205 basic file uploads and...
On Ruby 1.9+, standard ruby character classes like \w, \d will only match 7-Bit ASCII characters: "foo" =~ /\w+/ # matches...
If you'd like to preview the crontab that whenever will deploy, run the following: bundle exec whenever
Each time thin boots, it prints a boot message : Thin web server (v1.6.3 codename Protein Powder) Maximum connections set to...
Web security basics Einführung in die Web Security 🇩🇪 provides essentials for the topic of this card. Read following chapters:
Goal of this lesson is to understand what middlewares in Rack are good for. Rack Start with these articles:
Running projects parallel makes some trouble with PDF generation. Use geordi rspec spec to force sequential tests for the whole...
Learn Enough Command Line to be Dangerous (it's in our library => Google Drive) CLI tricks every developer should...
JavaScript is a scripting language supported by all browsers. Browsers don't speak Ruby, so if we want to implement...
Rails is our web framework. Goals Be able to write a simple Rails application. Understand how Rails talks to the...
Investigate why mails are frozen The exim documentation says: Freezing occurs when a bounce message encounters a permanent failure because...
dmesg shows the kernel ring buffer containing low-level system messages. Per default, dmesg shows a timestamp:
In RSpec you can tag examples or example groups with any tags you like simply by saying describe ReportCreator, slow...
Fontawesome 4 has introduced new naming conventions that make it easy to retrieve variants of a given icon.
This cheat sheet...
...aims at providing a quick reference to the most commonly used features in AngularJS.
Gem to show failing specs instantly. Unlike the --fail-fast option it doesn't abort abort on the first failure...
You can do so much more than console.log(...)! See the attached link for a great breakdown of what the developer...
Adobe no longer supports their PDF reader on Linux and the official page does not offer it for download. \
Right-click on the frame Select Frame... Open Background Set As to "Color" Set the background color...
By default, Twitter Bootstrap's print styles include printing links. /* Bootstrap's way of printing URLs */ @media print {
tlmgr is the TeX Live Manager and responsible for the TeX installation on your (Linux) machine. If you're getting...
If you have issues with PDFs, fix them like this: pdftk .pdf output .pdf Background I had an issue where...