Small fixes:
* (README) fixed fuckup with anchor * (wtfunctional.tex) Added shellesc to fix TeXLive2016-issue * (wtfunctional.tex) specified aspect ratio explicitly
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Readme.md
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Readme.md
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@ -27,8 +27,8 @@ using functional paradigms.
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## Files ##
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You may download both [the slides PDF][slides] in handout mode, and a
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[source archive][examples] of the examples used during the talk.
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You may download both [the slides PDF][ext-slides] in handout mode, and a
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[source archive][ext-examples] of the examples used during the talk.
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## Structure ##
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@ -70,8 +70,8 @@ following:
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again, texlive should be enough), and
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* the two fonts [Inconsolata G][inconsolata-g] and [Fira Sans][fira] installed,
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* not to talk of biber with biblatex.
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Then, compile using
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Then, compile using
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```
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lualatex -shell-escape wtfunctional
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@ -88,13 +88,13 @@ For the haskell-example, use `ghci`, then `:load 01_haskell.hs`. The functions p
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* extract (≅ fst)
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* addto
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* mfold (≅ foldl)
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02_python.py can be executed using `python`, or inspected using `python -m`. It
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provides:
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* a debug-function usable as decorator
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* a bubblesort-implementation using functional paradigms.
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03_cpp.cpp needs a compiler capable of C++11. It shows code- and
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runtime-examples for `for_each`, `transform` and `accumulate`.
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@ -105,7 +105,7 @@ do. Then compile using the option `std=c++1z`
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This is licensed under MIT-License. For the exact formulation, see License.txt.
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[examples]: https://www.pheerai.de/assets/wtf_examples.tar.gz
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[ext-examples]: https://www.pheerai.de/assets/wtf_examples.tar.gz
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[f3l]: https://www.f3l.de
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[f3lgit]: https://git.f3l.de/pheerai/wtfunctional
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[fira]: https://github.com/mozilla/Fira
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@ -116,7 +116,7 @@ This is licensed under MIT-License. For the exact formulation, see License.txt.
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[minted]: http://github.com/gpoore/minted
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[pygments]: http://pygments.org/
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[python]: https://python.org/
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[slides]: https://www.pheerai.de/assets/wtf_slides.pdf
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[ext-slides]: https://www.pheerai.de/assets/wtf_slides.pdf
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[texlive]: https://www.tug.org/texlive/
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[wtfoff]: https://www.pheerai.de/wtf/
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@ -3,6 +3,8 @@
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\usepackage{upquote}
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\usepackage[section, cache=true,]{minted}
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\renewcommand{\MintedPygmentize}{/usr/bin/pygmentize}
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\usemintedstyle{manni}
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\newminted[ccode]{c}%
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@ -1,8 +1,9 @@
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\documentclass[english]{beamer}
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\documentclass[english,aspectratio=43]{beamer}
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\usepackage{babel}
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\usepackage{csquotes}
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\usepackage{tabularx}
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\usepackage{shellesc}
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\usepackage[backend=biber,]{biblatex}
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\bibliography{wtf}
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\renewcommand{\bibfont}{\small}
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@ -18,7 +19,8 @@
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\title{WTFunctional}
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\author{Oliver Rümpelein}
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\subtitle{Using functional structures in non-functional languages}
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\subtitle{Functional paradigms and non-functional languages}
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\date{2016-06-11}
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\input{headers/listings}
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@ -39,7 +41,7 @@
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\section{Dafunc?}
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\subsection{Functional programming}
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\begin{frame}{Understanding functional paradigms}
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Here: so called \enquote{purely functional} paradigm.
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Here: so called \enquote{purely/strict functional} paradigm.
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\begin{itemize}
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\item<+-> Programming without \enquote{side-effects}
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\begin{itemize}
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@ -67,13 +69,13 @@ int main() {
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\end{frame}
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\begin{frame}{Pros and Cons}
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Pros:
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\uncover<+->{Pros:}
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\begin{itemize}[<+->]
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\item Maintainability
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\item Testing
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\item (often) shorter code
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\end{itemize}
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Cons:
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\uncover<+->{Cons:}
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\begin{itemize}[<+->]
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\item harder to learn
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\item harder to understand
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@ -81,6 +83,18 @@ int main() {
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\end{itemize}
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\end{frame}
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\begin{frame}{Languages}
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\begin{itemize}[<+->]
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\item Haskell(*)
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\item Clojure(*) (runs in JVM)
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\item F\#, OCaml
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\item Ada, Lua, Scala
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\item Lisp/Scheme and dialects (some (*))
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\item JS, Python, Swift
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\item Swift
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\end{itemize}
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\end{frame}
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\subsection{Case study: Haskell}
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\begin{frame}{Overview}
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\begin{itemize}[<+->]
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@ -95,7 +109,7 @@ int main() {
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\end{frame}
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\begin{frame}[fragile]{Syntax – Functions}
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Function constraints, definition and calls:
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Function definition and calls:
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\begin{haskell}
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mysum :: Num a => a -> a -> a -> a
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mysum x y z = x + y + z
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@ -103,7 +117,7 @@ mysum x y z = x + y + z
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b = mysum 1 2 3
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\end{haskell}
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\pause
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Functions always get evaluated left to right, thus the following works (\emph{Currying}):
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Functions always get evaluated left to right, thus the following works (\emph{\enquote{Currying}}):
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\begin{haskell}
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mysum2 = mysum 2
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-- c == 12
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@ -158,7 +172,7 @@ c = addto b 4
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\item Represent \enquote{anonymous} functions, i.e. locally defined functions
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without associated name
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\item Can simply be passed to algorithms, i.e. sort.
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\item Syntax: \haskellcmd{\var1 var2 -> retval}
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\item Syntax: \haskellcmd{\var1 var2 -> retval} (The \haskellcmd{\} is for λ)
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\end{itemize}
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\end{frame}
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@ -177,7 +191,7 @@ c = addto b 4
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\item \emph{Folds} (or sometimes \emph{reductions}) create single values
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using whole lists, i.e. sums over all elements
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\item Often implemented using recursion
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\item Need a function, an initialization value and a list
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\item Need a function, an initialisation value and a list
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\end{itemize}
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\end{frame}
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@ -191,11 +205,12 @@ msum = mfold (+) 0
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g = msum [1..100]
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\end{haskell}
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\uncover<+->{Note that this gets pretty resource hungry with large
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lists, better use left-folds for this (see~\cite{whichfold})}
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lists, better use left-folds for this (see~\cite{whichfold}, not shown
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here as they are more complicated)}
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\end{frame}
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\begin{frame}[fragile]{Example: Pythagorean triangles}
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Get all Pythagorean triangles with a hypotenuse off length at most 15:
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Get all Pythagorean triangles with a hypotenuse of length at most 15:
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\begin{haskell}
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> [(a,b,c) | a <- [1..15],
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b <- [1..a],
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@ -228,8 +243,8 @@ mbsort = bsort (\x y -> (x > y))
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\begin{itemize}[<+->]
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\item Obviously, python is not strictly functional…
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\item …but has functions as first class objects!
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\item Some other stuff is widely used, but with another syntax…
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\item …, although there are ways to get the \enquote{real} functional
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\item Some other stuff is widely used, but with another syntax,…
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\item … although there usually are ways to get the \enquote{real} functional
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style.
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\item I use python3 here, python2 differs in some points.
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\end{itemize}
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@ -243,7 +258,7 @@ mbsort = bsort (\x y -> (x > y))
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\item \emph{Note:} Most functional list-functions return iterators in
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python, not lists!
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\item Use \pycmd{list()} to cast Iterators, but this is usually not
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necessary.
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necessary (you use them as iterators either way).
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\end{itemize}
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\end{frame}
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@ -269,13 +284,14 @@ print(b)
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\begin{frame}[fragile]{Fold}
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\begin{itemize}[<+->]
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\item From the python2 to python3 Changelog:
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\item From the python2 to python3 changelog:
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\begin{quote}
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Removed `reduce()`. Use `functools.reduce()` if you really need it;
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however, 99 percent of the time an explicit `for` loop is more
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readable.
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\end{quote}
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\item I disagree – Old-style is more explicit and still available from \pycmd{functools}
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\item I disagree – Old-style is more explicit and still available from
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\pycmd{functools}, plus reduce is faster with build-in functions.
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\item Example – sum of squares
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\begin{pycode}
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from functools import reduce
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\begin{itemize}[<+->]
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\item \enquote{Classical} \cpp{} has a few functional elements…
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\item …but lacks lambdas, for instance.
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\item This changed with the modern standards, starting from \cpp{}11.
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\item This changed significantly with the modern standards, starting from \cpp{}11.
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\end{itemize}
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\end{frame}
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\item In \cpp{}, \emph{Iterators} are equivalent to lists in functional languages.
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\item Examples of iterators include \cppcmd{vector} and \cppcmd{array}.
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\item See~\cite{cppiter} for more information about the specific iterator
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types and the prerequisites they bring.
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types and the necessary prerequisites.
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\end{itemize}
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\end{frame}
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@ -509,7 +525,7 @@ auto sum(const auto&... args)
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\begin{frame}[plain]{Thanks for listening!}{Any questions?}
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\href{https://git.f3l.de/pheerai/wtfunctional/}{Git-Repo with examples and
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slides}: \url{git.f3l.de/pheerai/wtfunctional/}
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slides}: \url{https://git.f3l.de/pheerai/wtfunctional/}
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\begin{description}
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\item[Mail:] \url{oli_r@fg4f.de}
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