Lambdaheads: Unterschied zwischen den Versionen
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=== 2016-04-13 Wed 19:30 (LOUNGE!!) === | === 2016-04-13 Wed 19:30 (LOUNGE!!) === | ||
− | ==== | + | ==== Topic: Category theory part 3 ==== |
− | |||
Third and (maybe) final part of Category Theory! | Third and (maybe) final part of Category Theory! | ||
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As always if you want to present or have a topic suggestions - please add a comment. Btw. if you want to talk and need help - just ask I'll be glad to help. | As always if you want to present or have a topic suggestions - please add a comment. Btw. if you want to talk and need help - just ask I'll be glad to help. | ||
− | Cheers Martin | + | Cheers Martin |
+ | |||
==== Teilnehmer ==== | ==== Teilnehmer ==== | ||
Version vom 16. März 2016, 00:24 Uhr
Lambdaheads | |
Status: | active |
Thema: | Lambdaheads |
Organisator: | citizen428, epsilonhalbe |
Treffen: | every 2nd Wednesday in the Month |
Zielgruppe: | Jeder mit Interesse an funktionaler Programmierung, vom Mathematiker zum Software-Entwickler. |
Inhalt: | Ein regelmäßiges Treffen von Leuten die sich für Lisp-Dialekte und funktionale Programmierung im Allgemeinen interessieren. |
Zuletzt aktualisiert: | 2016-03-16 |
WTF
Ein regelmäßiges Treffen von Leuten die sich für Lisp-Dialekte und funktionale Programmierung im Allgemeinen interessieren.
Kommende Events
Jeder 2te Mittwoch im Monat
nächste reguläre Termine
Termin: Die Organisation der Lambdaheads wurde auf meetup verschoben - bitte dort die Themenlage ansehen die Announcements passieren ca 1-2 Wochen vor dem eigentlichen Termin.
2016-04-13 Wed 19:30 (LOUNGE!!)
Topic: Category theory part 3
Third and (maybe) final part of Category Theory!
We will do a short recap and then
- natural transformations - a.k.a. "functors" of categories
- universal constructions
- sum
- product
- learn what is so universal about them
- see why Hask is not a category
- maybe have an expert guest whom you can ask about everything you wanted to know, I'll let you know in the comments section wether he has time.
As always if you want to present or have a topic suggestions - please add a comment. Btw. if you want to talk and need help - just ask I'll be glad to help.
Cheers Martin
Teilnehmer
2016-05-11 Wed 19:30 (Library)
Topic: Taming the parallel beast
Practical functional programming - can you believe it!
Functional programming is known, well at least said to be one of the best paradigms for structuring concurrent and/or parallel programs. This time we try to give prove for that.
I expect some talks by you - as every other month I do need a break - volunteers step forward! There is two months time to prepare something big or something tiny, all of you are awesome people - especially if you help me and present ;-). If you need help preparing a talk, ask and you shall receive!
Topic suggestions to prepare for you are
- Haskell
- STM (= software transactional memory)
- Par/Seq, Lvish
- accelerate
- data parallel haskell
- Erlang
- guess almost everything is concurrent there
- Scala
- actors
- Clojure's
- data.async
- Agents, Atoms
for the haskell stuff take a look at Simon Marlowe's book http://chimera.labs.oreilly.com/books/1230000000929/index.html
If you have a talk with a topic other than parallelism/concurrency I'll gladly accept it.
Cheers martin
Teilnehmer
Vortragswünsche
- NixOS - A linux with functional package manager (ε/2, phaebz)
- Elm - Functional Reactive Programming (ε/2)
- Cryptol - a DSL for cryptography (ε/2)
- Coq - a proof assistant (ε/2?)
- Interfacing to SDL/Games in functional languages (Purely Functional Retro Games)
- Readable/non-trivial Haskell Examples (ε/2, e.g. Pandoc)
- How Darcs works
- Two λ enter, one λ leaves: Snap vs. Yesod (ε/2)
- Emacs (ε/2)
- http://lambdacube3d.com/
Vortragsvorschläge
- Hunchentoot, Web programming, maybe hunchentoot-fcgi (WIP) or Postmodern (japhy)
- Zippers (citizen428)
- fold and it's universal mapping property - ein versuch fold kennenzulernen - ε/2
- Intro to QuickCheck and Software Testing in Haskell (ε/2)
- Intro to a Clojure Web Framework (Noir semi-done, again citizen428)
Links
Kontakt
- citizen428 - derzeit auf Weltreise
- epsilonhalbe
Frühere Events
2016-03-09
- 19:30 Parsing in Haskell
2016-02-10
- 19:30 Category Theory part 2
2016-01-20
- 19:00 Functional Calisthenics - by Peter 'codecop' Kofler
2015-12-09
2015-11-11
- functional web experience meetup
- hdgarood - purescript
- gregor riegler - purescript
- peter - jboss (erlang webframework)
2015-10-21
- No agenda meetup
- skillsmatter conference
- haskell stack tool
- thinking about function composition/functor/applicative/warm fuzzy things
Summer break
2015-07-02 special
- Lambda-Calculus/Dependent-Type Theory meetup a lecture at the university of vienna dpt. of logic by prof. dana s. scott
- slides
2015-06-10
- Coding dojo - minesweeper kata comparing languages (Java, php, haskell(1,2,3) …) meetup
- haskell martin
- F# andreas schlapsi
- c
- dart
- java
2015-05-13
2015-04-08
- Fun with Functions - Haskell tutorial part 3
2015-02-11
- 19:00 Power of polymorphism, a beginner's tutorial for haskell meetup (part 2)
2015-01-14
- 19:00 installing Haskell/git (if necessary)
- 19:30 Types and Typos, a beginner's tutorial for haskell with a focus on error messages - see more on meetup
2014-12-10
- no meeting has happened
2014-11-12
- Web scraping with Haskell
- Next steps in writing a reporting tool in Haskell
2014-10-08
- A gentle intro to swift - many thanks to the Cocoaheads and Mikael
- Drawing with Haskell (TagCloud, Calendar) a first step in building a reporting tool with haskell
2014-09-10
- Record Syntax, Lenses and Prisms - Part 2 (@epsilonhalbe)
2014-08-13
- Record Syntax, Lenses and Prisms - Functional getters, setters and a bit more (@epsilonhalbe)
- STM with Finalizers (@schrototo), fork auf github [
2014-07-09
- Monads: a presentation of the Blogpost by Dan Piponi
- Gespräche über allerlei Themen
2014-06-09
- Cryptol a language for cryptography released by Galois.inc
2014-05-14
- Clojure
- Installing Clojure (wenn notwendig)
- Lösen der Clojure Koans - so weit wie es uns gefällt
- Martin berichtet von den Linuxwochen wo er einen Vortrag zum Thema Haskell gehalten haben wird
2014-04-09
A* algorithmus in Haskell- Testen in Haskell (Unit Tests, Property Tests, Proof, Criterion, Profiler) Stuff
2014-03-14
Einführung in Haskell: Buchstaben nach ASCII-Art Stuff
http://technologyconversations.com/2014/02/25/java-8-tutorial-through-katas-berlin-clock-easy/
http://blog.sigfpe.com/2006/08/you-could-have-invented-monads-and.html
2013-07-16
generators in future ECMAscript (node.js 0.11.2) - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators
Python 3
def pager(lines, pagelen=60): for lineno, line in enumerate(lines): yield line if lineno % pagelen == 0: yield "\f" for line in pager((range(10000))): print(line)
Perl 6
use v6; sub pager($lines, $pagelen=60) { gather for zip 1..200, $lines -> $lineno, $line { take $line; take "\f" if $lineno %% $pagelen } } for pager(1..*, 30) -> $line { say $line; }
Haskell
pager ::(Show a) => [a] -> Int -> [String] pager xs n = [if i %% n then show x else "\f" | (x,i) <- zip xs [1..]] (%%) :: Int -> Int -> Bool i %% n = (rem i n) /= 0 main :: IO () main = putStr ( unlines (pager [1..10000] 60))
2013-06-18
comb, one of the opposites of join (the other one is split)
String.prototype.comb = function(re) { // lol type conversion the hacky way re = ('' + re) // now it's a string .replace(/^\//, '') // hack off leading .replace(/\/$/, ''); // trailing delimiter // no interpolation, no sigils, no sprintf return eval('this.match(/(' + re + ')+/g)'); }
gather/take construct reimplemented for JS - a replacement for the idiom of declaring a collecting variable and pushing into it occasionally http://perl6.wikia.com/wiki/Gather
function gather(fn) { var guard = new Array; var take = function (items) { guard = guard.concat(items); }; fn(take); return guard; }; console.log( gather(function(take) { for (var i = 0; i <= 10; i++) { if (i % 2) { take(i); } } }) ) var arr = []; for (var i = 0; i <= 10; i++) { if (i % 2) { arr.push(i); } }
Haskell example is incomplete
gather x = foldr (:) [] x main = print $ gather [0..10]
reimplementation of List::Gen::by http://p3rl.org/List::Gen#by-NUM-LIST (no generators, just list transformation)
function by(n, a) { var r = new Array; while(a.length) { r.push(a.splice(0, n)); }; console.log(a); return r; }; function by2(n, a) { return a.length ? [a.slice(0, n)].concat(by2(n, a.slice(n))) : []; } console.log( by2(5, [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]) ); console.log( by2(5, [1,2,3,4,5,6,7,8,9,10,11,12,13,14]) ); console.log( by2(5, [1,2,3,4]) ); console.log( by2(5, []) );
// contrib by intval // divides array into equal arrays, each of size n function by(n, arr) { function byby(n, arr, accum) { if(arr.length < 1) { return accum; } var head = [arr.slice(0,n)]; var tail = arr.slice(n); return byby(n, tail, accum.concat(head)); } return byby(n, arr, []); } console.log( by(5, [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]) ); console.log( by(5, [1,2,3,4,5,6,7,8,9,10,11,12,13,14]) ); console.log( by(5, [1,2,3,4]) ); console.log( by(25, []) );
2013-05-21
A revival to much muttering, fretting and frowning of brows!
- A little tutorial on Monads (ε/2)
- Func-prog in JS:
2012-10-15
- Coding Challenge: bring your favourite languages, solve a small practical real-world problem from Stack Overflow in a functional fashion, let's hack and learn from each others' solutions [1] [2]
http://stackoverflow.com/questions/12872469
2012-09-17
- Introduction to Scala von Alex (Scala_User_Group)
2012-08-20
- Burrows-Wheeler Transformation aus "R.Bird - Pearls of functional Programming"
- Algorithmus durchbesprechen und
- Ein bischen testen mit QuickCheck
2012-07-23
2012-06-25
- ClojureC - neues Projekt von schani
2012-05-24
- neues bei Pugs
2012-04-30
- Casting SPELs in Lisp (EmacsLisp version)
- Haskell tutorial von Conrad Barski
- Learn Haskell Fast and Hard
- Solution for Martin's coding challenge
- Yesod Buch
2012-03-05
Mo, 2012-04-02 ab 19:30 Uhr in der Bibliothek im Metalab
Mo, 2012-03-05 ab 19:30 Uhr in der Bibliothek im Metalab
Programm: Ich bin vor kurzem auf den catalyst coding contest hingewiesen worden und habe versucht das Challenge von 2010 in Haskell zu lösen, und stehe nun (ich armer Tor) vor dem 5ten Level. Und komm nicht weiter. Ich werde meinen Code präsentieren und wäre interessiert Lösungen funktionaler und nichtfunktionaler Art zu sehen, bzw. hoffe ich auf Ideen eurerseits wie ich weitercoden könnte.
Mein Zeug bzw die Aufgabenbeschreibungen (als pdf) findet Ihr auf github - ε/2
2012-02-13
Mo 2012-02-13 ab 19:30 in der Bibliothek im Metalab
Programm:
- Gerald Wodni - Forth
- herumspielen mit Forth dazu bitte GForth installieren
- Gerald's Slides
- A minimal "FORTH" in Ruby by citizen428
- The Lisp Curse may also be the FORTH curse
- Why Concatenative Programming Matters
2012-01-09
Mo, 2012-01-09 ab 19:30 Uhr in der Bibliothek im Metalab
Programming Challenge by daxim. Solutions in Ruby (citizen428), Haskell (ε/2), Python2 (a friend of ε/2) and Common Lisp (japhy).
2011-11-12
Mo., 2011-11-12, ab 19:30 Uhr im Hauptraum im Metalab
angeregte Diskussion auf der Couch vor der Blinkenwall über alles mögliche™
2011-10-17
Mo, 17.10. ab 19:30 Uhr in der Bibliothek im Metalab
- Chakotay von Schani
2011-09-19
Mo, 19.9. ab 19:30 Uhr in der Bibliothek im Metalab
- Overview: Martins (=ε/2) Spielprojekt "Algebra Alchemy"
- Symbolic Algebra
- Algebraic Expression Trees
- Parsing
- Testing (HUnit)
- Documentation (Haddock)
- Symbolic Algebra
in Haskell all DIY - hopefully readable ;-)
2011-08-29
Lambdaheads Spezial, 29.8., 18:15 - 19:45
User:Antifuchs zeig AllegroGraph in der Bibliothek im Metalab.
2011-07-25
Mo, 25.7. ab 19:30 Uhr in der Bibliothek im Metalab
- Clojurescript
- https://github.com/daveray/seesaw
- http://nakkaya.com
- Planet Clojure
- http://jonathan.tang.name/files/scheme_in_48/tutorial/overview.html
- http://98.245.80.27/tcpc/OSCON2011/gbu/gbu.html
2011-06-27
Mo, 27.6. ab 19:30 Uhr in der Bibliothek im Metalab
- OCaml is dead - long live OCaml
- Sequential versus ISeq - Clo-shure?!?
- Haskell examples - code of a newbie (ε/2)
- Misc stuff to read the Monad.Reader #13 - Typeclassopedia
2011-05-30
Mo, 30.5. ab 19:30 Uhr in der Bibliothek im Metalab
- Introduction to F# (citizen428)
- Robert Zinkov: http://lafp.us/
2011-05-02
Mo, 2.5. ab 19:30 Uhr in der Bibliothek im Metalab
- So you want to learn Clojure? (citizen428)
- Buch: Learn You A Haskell for Great Good (citizen428)
2011-04-04
Mo, 4.4. ab 19:30 Uhr in der Bibliothek im Metalab
- Testen wie ein Weltmeister mit TAP (Daxim)
- Dies und das: https://gist.github.com/c7d4744047a2bb3b3c9c (citizen428)
2011-03-07
Mo, 7.3.2011 ab 19:30 in der Bibliothek im Metalab
2011-02-07
Mo, 7.2.2011 ab 19:30 Uhr in der Bibliothek im Metalab
- Y-Combinator in Perl/Lisp/Javascript (citizen428)
- myReverse list - a hard task todo on the fly - except in haskell ;-) (ε/2)
2011-01-17
Mo, 17.1. ab 19:30 Uhr in der Bibliothek im Metalab
- Func proc basics (citizen428)
- Land of Lisp (citizen428)
2010-11-29
Mo, 29.11. ab 19:30 Uhr in der Bibliothek im Metalab
- Func proc concepts: Monads (citizen428)
Brian Beckman's "Don't fear the Monads" talk
2010-10-04
Mo. 04.10.2010 ab 19:30 Uhr in der Bibliothek im Metalab
- Common Lisp Object System (japhy)
2010-09-06
Mo. 06.09.2010 ab 19:30 Uhr in der Bibliothek im Metalab
- Func proc concepts: Higher-order functions (citizen428)
- Functional programming in Perl 6 (Daxim)
- Function level programming with APL and J (citizen428)
2010-07-12
Mo. 12.07.2010 ab 19:30 Uhr im Hauptraum im Metalab
- Introduction to Scala (MSch)
- Erlang (Lefant)
- Random func prog tidbits (citizen428)
2010-06-14
Mo. 14.06.2010 ab 19:30 Uhr in der Bibliothek im Metalab
- Functional features of C# (Metaz)
- Emacs for CL development (Antifuchs)
- PLT Scheme goes Racket (citizen428)
- The Little Schemer (citizen428)
2010-05-17
Mo. 17.05.2010 ab 19:30 Uhr in der Bibliothek im Metalab
- New GHC packages for openSUSE (Daxim)
- Pure Programming Language (Chris)
- Announcement Clojure IRC bot (cypher)
- The monthly "What's new in Clojure land?" (citizen428)
2010-04-19
Mo. 19.04.2010 ab 19:30 Uhr in der Bibliothek im Metalab
- What is functional programming? - Diskussion anhand der Workshop-Slides (citizen428 & red667)
- Neue Features in Incanter 1.2 (citizen428)
- Common Lisp: format and more (Antifuchs)
2010-03-22
Mo. 22.03.2010 ab 19:30 Uhr in der Bibliothek im Metalab
- Lambdaheads: Was, warum, wieso, etc.
- citizen428 zeigt Incanter
- citizen428 stellt Clojure 101 vor
- Antifuchs zeigt CLIM (klassisch und modern)
- Functional Programming in Perl 6