what is this operator called and what is it used for <=>

Question

I recently came across this magical operator when digging into Groovy: <=>

Groovy has really made me happy with elvis operators ?. and ?: which I use constantly

Answer 1

It's called the spaceship operator and is also commonly used for comparison in Ruby.

http://www.objectpartners.com/2010/02/08/the-groovy-spaceship-operator-explained/