This card tries to summarize by example the different uses of heredoc. In Ruby << vs. <<- vs. <<~ In Rails strip_heredoc...

The linked article states that CSS breakpoints should group "similar" screen sizes and thus be at: 600px "narrow"

You can use three different versions of the regular expression syntax in grep: basic: -G extended: -E(POSIX)

This method will remove automatically installed packages that no other packages depend on any more. This, of course...

If your external displays not switching on or showing a weird behavior (for e.g. all displays getting the same configuration...

When giving a presentation with a projector it is sometimes better to use a dual screen layout instead of a...

There is no CSS selector for matching elements that contains a given string ¹. Luckily, Capybara offers the :text option to...

When testing your command line application with Aruba, you might need to stub out other binaries you don't want...

A Rake task appears in rake -T if it has a description: desc 'Compile assets' task :compile do ... end

When you're writing specs for ActiveRecord models that use memoization, a simple #reload will not do: it 'updates on...

We used zeroclipboard.js in some of our projects but now we switched to clipboard.js because it does not rely on...

Yesterday I stumbled across a talk in which the guy mentioned module sub-classing. I was curious what you can...

A haml angular 1 template with .thing(class="is-{{:: item.type }}") will be compiled (by haml) to which is not what...

In order to have monitoring for Sidekiq (like queue sizes, last run of Sidekiq) your application should have a monitoring...

Closure_tree lets your ActiveRecord models act as nodes in a tree data structure. This promises a few improvements over...

Instantiating ActiveRecord objects comes expensive. To speed up things, you can choose a more direct way to talk to your...

Knowing when to refactor Just feeling like refactoring is not a good reason to do it. Make an educated decision...

When working with custom transactions and use ActiveRecord::Rollback you may encounter unexpected behaviour if you try to roll back...

We often use VCR to stub external APIs. Unfortunately VCR can have problems matching requests to recorded cassettes, and these...

SVG is an acronym for "scalable vector graphics". SVGs should be used whenever an image can be described with vector...

#reverse_order does not work with complex sorting constraints and may even silently create malformed SQL for rails < 5.

Rails 5 / 6 / 7 Method Uses Default Accessor Saves to Database Runs Validations Runs Callbacks Updates updated_at/updated_on Respects Readonly...