Map and flatmap applications are used in functional languages.In java it finds in optional,stream and completable futures.streams represent a sequence of objects.optional represents a value.Both the function have the same return type but slight difference to each other.
Map is define in optional that returns exact type.most complex cases that can written in optional.In this type do not adding internal warpping. It is also support nested structure.
Stream of the map and flatmap function wired in the same way of optional. map allows to sequence in a stream instance. flatmap allows to avoid nested stream.map produce stream results for uppercase() method.
In complex cases the listed input is execute array of string. flatmap method input streams to be stream of strings.In java language the both method invokes streams and optional.this method to get mapped objects to provide mapped function.
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