Stream (computer science)

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For the more applied concept in computing, see Stream (computing).

In type theory and functional programming, a stream is a potentially infinite analog of a list, given by the coinductive definition:

data Stream α = Cons α (Stream α)

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.

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