Groovy is absolutely phenomenal for scripting. Optionally typed, has the entire Java ecosystem of libraries available (with no extra download or build files nec

Groovy is absolutely phenomenal for scripting. Optionally typed, has the entire Java ecosystem of libraries available (with no extra download or build files neccessary), very good IDE support, mature, extremely rich common library, great performance. I've built entire prototypes in Groovy at amazing speeds and then gradually replaced individual files with Java/Kotlin code and made sure the entire thing still worked. When I had grabbed everything of value I copied the resulting Java/Kotlin files to the real codebase and deleted the prototype. I could've left them in Groovy, too, as it is quite performant enough, alas customers preferred Java/Kotlin.