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The Iterator Pattern allows sequenti= al access to the elements of an aggregate object without exposing its under= lying representation.=20
Groovy has the iterator pattern built right in to many of its closur=
e operators, e.g.
eachWithIndex as =
well as the
for .. in loop.
For example:=20 =20
Results in the output:=20 =20
Another example:=20 =20
Results in:=20 =20
The iterator pattern is also built in to other special operators such as=
ors for working with streams, URLs, files, directories and regular expressi=