This read-only property is the number of elements in the collection.
Gets an Iterator that can iterate over the items in the collection.
Typical usage is:
var it = anIterableCollection.iterator;
while (it.next()) {
var item = it.value;
}
Returns the first item in the list, or null if there is none.
This returns null if there are no items in the list.
This interface is implemented by the List, Set, and Map classes; it provides the iterator read-only property that returns an Iterator.
Typical usage is: