Ruby Facets

Ruby 2.4.0 Since Ruby Facets took a Winter break, we missed the joyful release of Ruby 2.4 on December 25th. Aside from the release blog post which listed the marquee features and improvements of this release, I highly recommend Jonan Scheffler's post on the Heroku blog which goes a LOT more in-depth about some of the changes. One of the most exciting for me is the introduction of the binding.irb command. It's a copycat of the binding.pry command from the Pry gem which allows you to open a breakpoint and stop execution of your Ruby program to inspect the state of code. This is an extremely useful debugging tool that until now required adding a gem to your Gemfile. If you've only ever done debugging with put statements, you really should try this out. Later in the post, Jonan goes full Ruby Under A Microscope on the way Hashes are actually implemented in Ruby. He shows how Vladimir Makarov's patch for Ruby 2.4 improved the performance of Ruby Hashes by more than 40% on modern CPUs. Jonan also goes wayyyyy too