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In type theory and functional programming, a stream is a potentially infinite analog of a list, given by the coinductive definition: [1] [2]
dataStreamα=Nil|Consα(Streamα)
Generating and computing with streams requires lazy evaluation, either implicitly in a lazily evaluated language or by creating and forcing thunks in an eager language. In total languages they must be defined as codata and can be iterated over using (guarded) corecursion.
Java provides the Stream interface under the java.util.stream namespace.
Python have the StreamReader and StreamWriter classes in the asyncio module. [3]
.NET provides the abstract class Stream [4] which is implemented by classes such as FileStream and MemoryStream. [5]
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The table shows a comparison of functional programming languages which compares various features and designs of different functional programming languages.