how can you define a namespace in DART language

In this article, i am going to explain about DART namespace.
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Namespace in DART language

DART have namespaces, much like java packages, basically  namespace is a logical grouping of classes, namespace contain classes, interface etc.

Definition of namespace

#library("http");

Using of namespace

#library("http.dart");

Optional prefix of namespace

#library("http.dart","http");

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