Fudgets

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In computing, Fudgets is a graphical user interface toolkit for the functional programming language Haskell and the X Window System.<ref>Template:Cite book</ref><ref>Template:Cite book</ref> Fudgets makes it easy to create client–server model applications that communicate via the Internet.

Most of the work on Fudgets was done in 1991-1996 by Thomas Hallgren and Magnus Carlsson.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

The authors claim that many of the advantages of Fudgets come from it being programmed in a lazy functional programming language.<ref>Template:Cite book</ref>

The main entity of toolkit is fudget (implemented on low level through stream processors) which has its own input and output.<ref>Template:Cite journal</ref> Fudgets can be composed in parallel or sequence, yielding new fudget which can be used in code as any other fudget.

Example

<syntaxhighlight lang="haskell"> factorialF = stdoutF >==< mapF (show . factorial . read) >==< stdinF factorial  :: Integer -> Integer factorial n = product [1..n] </syntaxhighlight>

The code is self-describing considering that >==< is sequential fudget plumbing and mapF is fudget that takes a function of one argument and makes a fudget which output is input applied to that function. Fudget composition must be read from right to left, as a simple function composition. Now you can simply write: <syntaxhighlight lang="haskell"> main = fudlogue factorialF </syntaxhighlight>

compile and run. For every given integer value it will print its factorial.

License

The software license of Fudgets claims that this software is freeware for non-commercial use only.

External links

• Template:Official website, latest release marked January 13, 2016
• Fudgets Phd thesis by Hallgren and Carlsson

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