New PDF release: Central European Functional Programming School: Second

By Rinus Plasmeijer, Peter Achten (auth.), Zoltán Horváth, Rinus Plasmeijer, Anna Soós, Viktória Zsók (eds.)

ISBN-10: 3540880585

ISBN-13: 9783540880585

ISBN-10: 3540880593

ISBN-13: 9783540880592

This quantity provides 8 conscientiously revised texts from chosen lectures given through prime researchers on the moment critical eu practical Programming tuition, CEFP 2007, held in Cluj-Napoca, Romania, in June 2007.

The 8 revised complete papers offered have been conscientiously chosen in the course of rounds of reviewing and development for inclusion within the e-book. The lectures conceal a variety of issues similar to interactive workflows, lazy useful courses, lambda calculus, and object-oriented practical programming.

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Extra info for Central European Functional Programming School: Second Summer School, CEFP 2007, Cluj-Napoca, Romania, June 23-30, 2007, Revised Selected Lectures

Sample text

It extends the *HSt environment with a boolean value activated to indicate the status of a task (when a task is called it tells whether it has to be activated or not, when a task has been evaluated it tells whether it is finished or not), a tasknr for the automatic generation of fresh task identifier values, and html which accumulates all HTML output. For each of these fields, we introduce corresponding update functions (set_activated, set_tasknr, and set_html): :: *TSt = { hst :: *HSt, :: TaskID :== [Int] set_activated :: Bool set_tasknr :: TaskID set_html :: [BodyTag] activated :: Bool, tasknr :: TaskID, html :: [BodyTag] } *TSt → *TSt *TSt → *TSt *TSt → *TSt With this administration in place, we can use taskEditor to lift iData elements to elemental iTasks, viz.

Here is what the actual newTask combinator does, as opposed to the core version of Sect. 4. value | done = (v,{tst & hst = hst}) (v,tst=:{activated = done,hst}) = t {tst & tasknr = [-1:tasknr] ,hst = hst} | not done = (v,{tst & tasknr = tasknr}) (_,hst) = mkStoreForm (Init,storeId) (const (True,v)) hst = (v,{tst & tasknr = tasknr, hst = hst}) ) where storeId = mkFormId (tasknr +> "_New") (False,createDefault) <@ Session 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. A storage is associated with task t (line 3) that initially has a default value (line 12).

This feature is added for testing, for the final application one needs of course to add a decent login procedure. Initially, myId is defaultUser, userId is the selected user, and the accumulator html is empty (BT [ ] ). After evaluation of a task, the accumulator contains all HTML output of each and every activated iTask. It is not hard to define a filtering function that extracts all tasks for the current user from the output tree. Version management is important as well for a multi-user web enabled system.

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Central European Functional Programming School: Second Summer School, CEFP 2007, Cluj-Napoca, Romania, June 23-30, 2007, Revised Selected Lectures by Rinus Plasmeijer, Peter Achten (auth.), Zoltán Horváth, Rinus Plasmeijer, Anna Soós, Viktória Zsók (eds.)


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