Einstein argued that there must be simplified explanations of nature, because God is not capricious or arbitrary. No such faith comforts the software engineer.
Learning a new programming language is a twofold task: learning the syntax and learning the standard library. Whereas learning the syntax is a matter of days and getting proficient with new language idioms may require a matter of a few weeks, working through a new library can easily take several months.
Luckily, no Java programmer needs to go through this time-consuming activity when learning Groovy. They already know most of the Groovy Standard Library, because that is the set of APIs that the Java Runtime provides. You can work with Groovy ...