A History of Haskell : Being Lazy With Class
This paper describes the history of Haskell, including its genesis and principles, technical contributions, implementations and tools, and applications and impact.
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This paper describes the history of Haskell, including its genesis and principles, technical contributions, implementations and tools, and applications and impact.
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The use of monads to structure functional programs is described. Monads provide a convenient framework for simulating effects found in other languages, such as global state, exception handling, output, or non-determinism. Three case studies are looked at in detail: how monads ease the modification of a simple evaluator; how monads act as the basis of a datatype of arrays subject to in-place update; and how monads can be used to build parsers.
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