Posted by naruse on 31 May 2018 We are pleased to announce the release of Ruby 2.6.0-preview2. Ruby 2.6.0-preview2 is the second preview toward Ruby 2.6.0. This preview2 is released earlier than usual because it includes an important new feature, JIT. JIT Ruby 2.6 introduces an initial implementation of JIT (Just-in-time) compiler. JIT compiler aims to improve performance of any Ruby program execu