Opal is a source to source ruby to javascript compiler, corelib and a runtime implementation that currently passes 3000 rubyspecs...
TLDR: This card explains which threads and processes interact with each other when you run a Selenium test with Capybara...
An annoying part of using font icons is that the icons usually need to live in the DOM. This is...
When I upgraded from 0.5.4 PDFKit deadlocked or crashed when an ApplicationController::RouteError occured. If this error happens only because...
Search engines, such as Google and Bing are engineered to crawl static web pages, not javascript-heavy, client-side apps...
We proudly release our safe_cookies middleware into public beta and just published it on Github. Features are:
So you client has asked you to implement a row of buttons to like the URL on Facebook, Twitter and...
You might not know that Rails disables CSRF protection in tests. This means that if you accidentally forget to send...
Copy the attached file to features/support. This gets you a convenience method: Capybara.javascript_test? Is true for Selenium, capybara-webkit...
Working with lists in Javascript is painful because the native Array class is so poorly designed. One way to reduce...
Angular comes with different types of services. Each one with its own use cases. All of these services are singletons...
The asset pipeline (which is actually backed by sprockets) has a nice feature where templates ending in .jst are compiled...
Consul 0.10.0 now allows multiple power mappings for nested resources. When using nested resources you probably want two power
Box shadows are awesome. Unfortunately they are also very costly to render. You will rarely notice the rendering time on...
So you're hunting down a regression (or just a bug) and want to use git bisect to find out...
We tend to use database transactions as a magic bullet to get rid of all our concurrency problems. When things...
For websites that don't do JavaScript rendering on the client, it's best practice to put script tags at...
Use the click method on the DOM element: let link = document.querySelector('a') link.click()
Connect to your memcached host. (AWS elasticache is memcached) telnet foohost23.cs2631.0001.euw1.cache.amazonaws.com 11211 Once you're connected, find out which 'slabs...
Set the hash to a dummy hash which doesn't hit any id at your page, for example: window.location.hash = "_";
This card shows how to upgrade a Rails 2 application from Rails 2.3.8 through every single patch level up to...
Coffeescript allows you to create classes whose methods are automatically bound to the correct this. You can do this by...
Our development process makes us deploy very often. As the number of releases grows, junk clogs up the hard drive...
Getting a regular expression from a string in JavaScript is quite simple: new RegExp('Hello Universe'); # => /Hello Universe/