rack-mini-profiler is a powerful Swiss army knife for Rack app performance. Measure SQL queries, memory allocation and CPU...
There are cases when you need to select DOM elements without jQuery, such as: when jQuery is not available
If you have many connections to your MySQL or MariaDB (as we have) you might want to filter the list...
CSS4 comes with :has. E.g. h1:has(b) would select all tags that contain a tag. This is implemented in...
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
You can use mail-tester.com to check your application's e-mails for issues that might cause e-mails to be...
You can configure a stat socket for haproxy in the global section of the configuration file: global daemon
With "attaching an event handler once" you possibly mean one of these two things: Register a function for an event...
Note This card does not reflect the current state of lazy loading technologies. The native lazy attribute could be used...
There are many solutions, but a very concise one is this: hash.merge!(hash) do |key, old_value, new_value|
git rebase -i -> mark your commit with edit git reset HEAD~ (remove the marked commit, but keep its...
One useful postgres command I stumbled upon recently was \x. It gives you an expanded display which allows you to...
You want to test your 1GE or 10GE internet uplink? We needed to ensure we have full 10GE to the...
When dealing with AR scopes, you can remove conditions, order, etc by using the unscope method. It is available on...
Redactor is yet another WYSIWYG editor. It definitely has its weak points, but I want to point out that it...
PostgreSQL's array data type is pretty useful, but manipulating values of arrays can be awkward because of its syntax...
Rails 4 introduced raising an error on pending migrations. This is most annoying when you are crafting a migration but...
Web fonts are great. They are also be really bad for front-end performance because they block rendering. You may...
Our applications not only need to be functional, they need to be fast. But, to quote Donald Knuth, premature optimization...
This is a guide on how to effectively use Git when working on a feature branch. It is designed to...
Starting with Ruby 1.9, most #each methods can be called without a block, and will return an enumerator. This is...
Rails 5 will introduce ActiveRecord::Relation#or. On Rails 4 and 3.2 you can use the activerecord_any_of gem...
When working with PostgreSQL, you can use pgAdmin as a GUI. While you can do most things just like on...