Remove null items from a list in Groovy

Question

What is the best way to remove null items from a list in Groovy?

ex: [null, 30, null]

want to return: [30]

Answer 1

This can also be achieved by grep:

assert [null, 30, null].grep()​ == [30]​

or

assert [null, 30, null].grep {it}​ == [30]​

or

assert [null, 30, null].grep { it != null } == [30]​