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

Usually you'd want to check its behavior with duck typing.

def foo = someMethod()
if (foo.metaClass.respondsTo('each')) {
  foo.each {println it}
}