Groovy adds some nice operators to the language to write brief code. We already learned about the Elvis operator and the Spaceship operator. And now we see what the spread-dot operator is about and what it does. The spread-dot operator (*.) is used to invoke a method on all members of a Collection object. The result of using the spread-dot operator is another Collection object.
* Groovy User Guide - Operators
* Dynamic object orientation - Using power features