Groovy has used the == operator to check if objects are equal for a long time. To test if object instances are the same we must use the is method. Groovy 3 adds a new operator for the is method and that is the === operator. And to negate the result of the is method we can use the !== operator.
In the following example we use the === and !== operator to check if objects refer to the same instance or not:
1 2 3 4 5 6 7 8 9 10 11 12 | def answer = new Integer(42)def anotherAnswer = new Integer(42)def meaningOfLife = answer// Equals is true for answer and anotherAnswerassert answer == anotherAnswer// But they don't refer to the same instance.assert answer !== anotherAnswer// The variables meaningOfLife and answer// do refer to the same object instance.assert answer === meaningOfLife |
Written with Groovy 3.0.2.
