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This allows using imperative code where it may be impractical to write functional code, while still keeping all the safety that pure code provides. Here is an example program (taken from the Haskell wiki page on the ST monad) that takes a list of numbers, and sums them, using a mutable variable:
The first revision, named Haskell 2010, was announced in November 2009 [2] and published in July 2010. Haskell 2010 is an incremental update to the language, mostly incorporating several well-used and uncontroversial features previously enabled via compiler-specific flags. Hierarchical module names.
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Download QR code; Print/export Download as PDF; Printable version; In other projects ... Articles with example Haskell code (56 P) H. Haskell software (1 C, 4 P)
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In the two citations that follow, Okasaki (pp. 144–146) gives a CONS example in Haskell wherein the polymorphic type system automatically flags programmer errors. [4] The recursive aspect is that the type definition assures that the outermost constructor has a single element, the second a pair, the third a pair of pairs, etc. recursively ...
Generalised Algebraic Datatype Page on the Haskell wiki; Generalised Algebraic Data Types in the GHC Users' Guide; Generalized Algebraic Data Types and Object-Oriented Programming; GADTs – Haskell Prime – Trac; Papers about type inference for GADTs, bibliography by Simon Peyton Jones; Type inference with constraints, bibliography by Simon ...
For example, digit parses a digit, and string parses a specific string (like "hello"). Parser combinator libraries like Parsec provide utility functions to run the parsers on real values. A parser to recognize a single digit from a string can be split into two functions: one to create the parser, and a main function that calls one of these ...