Groovy 3
The Apache Groovy programming language - Groovy 3.0 release notes
Groovy 3 Highlights : Groovy
Groovy 3 Quick Review - the most anticipated Groovy version is finally here! | #groovylang - YouTube
Groovy 3 & Beyond: An Insider's Guide - YouTube
Groovy update: What's new in Groovy 2.5 and 3.0 and what's coming in 4 and beyond - YouTube
Groovy 3 @NullCheck annotation example - tutorial | #groovylang - YouTube
Groovy 3 YamlSlurper and YamlBuilder examples - tutorial | #groovylang - YouTube