Upgrading from Ruby 1.8.7 to 2.1.2 took me an hour for a medium-sized application. It involved hardly any changes...

Firefox 5.0.1, which we were using for most Rails 2.3 projects, does not run on Ubuntu 14.04 any more. Here...

In a JavaScript console, type this: > 9112347935156469760 9112347935156470000 Ooops. And that's not a float! This occurs because JavaScript uses...

JavaScript's NaN ("Not a Number") is hard to compare against. It never equals anything, not even itself:

Since we are using LoDash instead of UnderscoreJS in recent/current projects, you should keep in mind that their syntax is...

We upgraded a Rails 2 application to Rails 3.2 and Ruby 2.1, changed the mysql adapter from mysql to mysql2...

To avoid n+1 queries, you want to eager-load associated records if you know you need to access them...

PDFKit converts a web page to a PDF document. It uses a Webkit engine under the hood...

If you want to move an element inside an array, neither JavaScript/ES6+ nor libraries like LoDash offet that natively.

edge_rider is Power tools for ActiveRecord relations (scopes). Please note that some of the functions edge_rider provides have...

You know each_with_index from arrays: ['hello', 'universe'].each_with_index do |value, index| puts "#{index}: #{value}" end

While RSpec 1 and 2 decided that specs inside spec/model are model specs, and those inside spec/features are feature specs...

Spreewald 1.1.0 drops the be_true and be_false matchers in order to be RSpec 3 and Ruby 2 compatible...

Code snippet tested with Rails 2.3 def index # ... if request.xhr? html = render_to_string(:partial => "list", :layout => false) respond_to...

The debugger gem does not seem to be properly working on Ruby 2. Use byebug instead! Byebug is a simple...

The attached RSpec matcher allows for comfortably testing delegation. Examples describe Post do it { should delegate(:name).to(:author).with...

SudoSlider is a simple yet powerful content slider that makes no (or very few) assumptions about your markup and is...

This card describes how to pass an array with multiple element to a JavaScript function, so that the first array...

You need this awkward command: page.driver.browser.action.move_to(page.find(selector).native).perform Note that there are better ways for newer Capybaras...

When you have a string containing umlauts which don't behave as expected (are not matched with a regexp, can...

There are 3 built-in file descriptors: stdin, stdout and stderr (std=standard). (You can define your own, see the...

Edge Rider gives your relations a method #origin_class that returns the class the relation is based on.