Fudgets

In computing, Fudgets is a graphical user interface toolkit for the functional programming language Haskell and the X Window System.^[1][2] 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.^[3]

The authors claim that many of the advantages of Fudgets come from it being programmed in a lazy functional programming language.^[4]

The main entity of toolkit is fudget (implemented on low level through stream processors) which has its own input and output.^[5] Fudgets can be composed in parallel or sequence, yielding new fudget which can be used in code as any other fudget.

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

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:

main = fudlogue factorialF

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

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

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

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