Functional programming and input/output /

Gordon, Andrew D.

Functional programming and input/output / Andrew D. Gordon. - Cambridge [England] ; New York : Cambridge University Press, 1994. - xv, 155 p. ; 26 cm. - Distinguished dissertations in computer science .

Includes bibliographical references (p. 137-147) and indexes.

Introduction -- A calculus of recursive types -- A metalanguage for semantics -- Operational precongruence -- Theory of the metalanguage -- An operational theory of functional programming -- Four mechanisms for teletype I/O -- Monadic I/O -- Conclusion

A common attraction to functional programming is the ease with which proofs can be given of program properties. A common disappointment with functional programming is the difficulty of expressing input/output (I/O), while at the same time being able to verify programs. Here, the author shows how a theory of functional programming can be smoothly extended to admit both an operational semantics for functional I/O and verification of programs engaged in I/O. He obtains, for the first time, operational semantics for the three most widely implemented I/O mechanisms for lazy languages, and proves that the three are equivalent in expressive power. He develops semantics for a form of monadic I/O and verifies a simple programming example. These theories of functional I/O are based on an entirely operational theory of functional programming, developed using Abramsky's 'applicative bisimulation'.

0521471036

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Functional programming (Computer science)
Computer input-output equipment.

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