Stackprof is a sampling call-stack profile for Ruby 2.1+. Instead of tracking all method calls, it will simply collect...
You know that Devise offers RSpec test helpers for controller specs. However, in request specs, they will not work.
A very informative and interesting presentation about browsing performance, looking at efforts Google Chrome takes to increase it.
Table of contents of the linked article: What are Web Fonts? Advantages of Web Fonts Disadvantages of Web Fonts
Note This card does not reflect the current state of lazy loading technologies. The native lazy attribute could be used...
You want to test your 1GE or 10GE internet uplink? We needed to ensure we have full 10GE to the...
Rails 4 introduced raising an error on pending migrations. This is most annoying when you are crafting a migration but...
Our applications not only need to be functional, they need to be fast. But, to quote Donald Knuth, premature optimization...
I recommend install Node.js using nvm. This way you can have multiple Node versions in your ~/.nvm. You also won...
If you see a stacktrace beginning with lines like this: E, [2015-07-16T09:23:10.896146 #23308] ERROR -- : app...
Rails comes with grouped_collection_select that appears to be useful, but isn't. As an alternative, consider the flat...
Note: Making a reverse proxy with nginx is much more straightforward. A reverse proxy is a "man in the middle...
When you have an element you want to hide, you can add a ng-show='isOpen' attribute to that element...
You might wonder about this request in your test.log: Started GET "/__identify__" for 127.0.0.1 at 2015-04-29 18:00...
You know that ActiveRecord caches associations so they are not loaded twice for the same object. You also know that...
RSpec 3 has verifying doubles. This breed of mock objects check that any methods being stubbed are present on an...
If you want to rotate text, you can use CSS transforms in somewhat modern browsers to rotate the container element...
Please don't simply copy line number links from Github. The URL usually contains a branch name like master which...
Webfonts are not always available when your JavaScript runs on first page load. Since fonts may affect element sizes, you...
When a CSS3 animation makes the animated element flicker, it may well be due to pixel fragments being handled differently...
The CSS property z-index is not as global as you might think. Actually, it is scoped to a so...
If you want to load an SQL dump from an ActiveRecord migration, you might find this to be harder than...
If you get this error (probably because you want to load some modules): # modprobe xt_comment FATAL: Could not load...
I couldn't successfully execute a simple iptables command and got this error on an Ubuntu server: # /sbin/iptables -I INPUT...