Marcin Kołodziej questions

Marcin Kołodziej answers

• Rails - "Required ruby-2.3.3 is not installed." after Ruby update to 2.5.3
• Rails 5 way to handle ActionController::ParameterMissing
• Are there performance reasons to prefer size over length or count in Ruby?
• Using a lambda as a default in Hash#fetch ruby
• rspec-mocks' doubles are designed to only last for one example
• Reducing an array of hashes into new hash
• Ruby array map(&:flatten) is causing a latency issue