What is the colon operator in Gradle?

Question

You always see code like

project(':bluewhale').hello 

This doesn't seem to be Groovy syntax, what is it?

Answer 1

The colon is not an operator (you can see it's being used inside a string). It's the separator that Gradle uses to describe paths to subprojects. For example,

evaluationDependsOn(':api:producer')

would look for the subproject producer of the subproject api.