Central European Functional Programming School: First by Zoltán Horváth

By Zoltán Horváth

This quantity provides 8 rigorously revised texts of chosen lectures given through best researchers of the sector on the first relevant eu sensible Programming university, CEFP 2005, held in Budapest, Hungary, in July 2005. The 8 revised complete papers awarded have been rigorously chosen in the course of rounds of reviewing and development for inclusion within the booklet. The lectures hide a variety of issues akin to new programming language recommendations for subtyping.

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Extra info for Central European Functional Programming School: First Central European Summer School, CEFP 2005, Budapest, Hungary, July 4-15, 2005, Revised Selected Lectures (Lecture Notes in Computer Science)

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Fig. 8 shows what this application looks like. The updatePage function for such an application is rather straightforward: updatePage :: [ Form Int ] *HSt → (Html , *HSt) updatePage intFs hSt = mkHtml "Integer Forms" ( [ H1 [ ] "Integer Forms" ] ++ bodies ++ [ toHtml (sum values ) ] ) hSt where (bodies , values) = unzip [ (BodyTag form , value) \\ {form , value}←intFs ] This function generates the proper page, regardless of the actual content of the list of integer forms. For the screen shot in Fig.

2 Testing Functions with First Order Logic The relation between input and output of a single function can be conveniently specified in predicate logic. g. indices(”A test”, t ) should yield the list [2, 5]. We can specify the result of this function in at least two ways: we can give a reference implementation (perhaps very inefficient, but obviously correct), or we can state a property about the resulting list on indices. Fully Automatic Testing with Functions as Specifications 37 Specification. #s − 1 • isMember (i, indices(s, c)) ⇔ s[i] = c The function isMember checks if the element occurs in a list, and #s is the length of the string s.

Bn , fn )] a form is created that has value fi whenever the application user has pressed button bi and the identity function otherwise. This function can be implemented using the general layoutIndexForm given above: ListFuncBut = layoutIndexForm (λf1 f2 → [ BodyTag f1:f2 ] ) FuncBut id (o) 0 The lower level function FuncBut creates a (Form (a → a) ) with a Button view. It uses the boolean and the integer to generate a fresh identification value for that element. Function composition is used to combine the callback functions from all button elements.

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