How to check in Groovy that object is a list or collection or array?

Question

The question is as simple as the title. How to check in Groovy that object is a list or collection or array? But can\'t find a simple way of checking it. Any ideas?

Answer 1

A List is a Collection, so the checks aren't mutually exclusive:

def foo = ...
boolean isCollection = foo instanceof Collection
boolean isList = foo instanceof List
boolean isSet = foo instanceof Set
boolean isArray = foo != null && foo.getClass().isArray()