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| Code Block |
|---|
def numbers = [1,2,3] assert numbers //true, as numbers in not empty numbers = [] assert !numbers //false, as numbers is now an empty collection |
Iterators and Enumerations
Iterators and Enumerations with no further elements are coerced to false.
| Code Block |
|---|
assert ![].iterator() // false because the Iterator is empty
assert [0].iterator() // true because the Iterator has a next element
def v = new Vector()
assert !v.elements() // false because the Enumeration is empty
v.add(new Object())
assert v.elements() // true because the Enumeration has more elements
|
Maps
Non-empty maps are coerced to true.
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