Groovy operators

These operators are very powerful:
If you have two lists and want to subtract one list from another:

myList = myList - yourList // requires that both lists have same type of elements.

Intersection

userIds.intersect(usersWithPermissions)

Split a name-value pair string to make it a String[]

String [] pair = someString.split(":") // now pair[0] = key and pair[1] = value