You want Spring for super-fast binstubs like bin/rails or bin/rspec which avoid Rails boot time. You want parallel_tests...
Things to check first Do you deliver fonts in a format that the target IE version understands? Did you double...
Sometimes you want to test migrations with production or staging data. Dumping single tables makes sense if a complete dump...
When building a web application, one is tempted to claim it "done" too early. Make sure you check this list...
So you downloaded a theme for Chrome a while ago and don't remember which one it is?
This service gives you a kind-of standard color name for any hex code. This is useful if you want...
The default Google Analytics might not work as expected with your Unpoly app. This is because your app only has...
The way that Javascript schedules timeouts and promise callbacks is more complicated than you think. This can be the reason...
As your Rails project grows, you will accumulate a number of small patches. These will usually fix a bug in...
The attached ImageLoader helper will start fetching an image and return an image that is resolved once the image is...
Sometimes you want to preload images that you will be using later. E.g. if hovering over a an area changes...
Cucumber's docstrings let you add long strings to a step like this: # foo.feature Given this text: """ First line
Tool to show you which gems are slow to load: ➜ git:(master) ✗ bundle exec bumbler [################################################# ] (49/65) travis-lint...
Enter any command into explainshell and it will explain it to you: split into separate commands (if present), with each...
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...