1067 lines
49 KiB
HTML
1067 lines
49 KiB
HTML
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<meta name="dcterms.date" content="2018-01-01">
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<title>Fortgeschrittene funktionale Programmierung in Haskell – Nicole Dresselhaus</title>
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<meta property="og:title" content="Fortgeschrittene funktionale Programmierung in Haskell – Nicole Dresselhaus">
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<a class="navbar-brand" href="../../index.html">
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<span class="navbar-title">Nicole Dresselhaus</span>
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</a>
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<div id="quarto-search" class="" title="Search"></div>
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<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarCollapse" aria-controls="navbarCollapse" role="menu" aria-expanded="false" aria-label="Toggle navigation" onclick="if (window.quartoToggleHeadroom) { window.quartoToggleHeadroom(); }">
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<a class="nav-link" href="../../index.html"> <i class="bi bi-house" role="img">
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<span class="menu-text">Home</span></a>
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<nav class="quarto-secondary-nav">
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<div class="container-fluid d-flex">
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</button>
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<nav class="quarto-page-breadcrumbs" aria-label="breadcrumb"><ol class="breadcrumb"><li class="breadcrumb-item">Serious</li><li class="breadcrumb-item">Coding</li><li class="breadcrumb-item"><a href="../../Coding/Haskell/Advantages.html">Haskell</a></li><li class="breadcrumb-item"><a href="../../Coding/Haskell/FFPiH.html">Fortgeschrittene funktionale Programmierung in Haskell</a></li></ol></nav>
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<div id="quarto-content" class="quarto-container page-columns page-rows-contents page-layout-article page-navbar">
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<nav id="quarto-sidebar" class="sidebar collapse collapse-horizontal quarto-sidebar-collapse-item sidebar-navigation docked overflow-auto">
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<div class="sidebar-menu-container">
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<ul class="list-unstyled mt-1">
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<li class="sidebar-item sidebar-item-section">
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<div class="sidebar-item-container">
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<a class="sidebar-item-text sidebar-link text-start" data-bs-toggle="collapse" data-bs-target="#quarto-sidebar-section-1" role="navigation" aria-expanded="true">
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<span class="menu-text">Serious</span></a>
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<a class="sidebar-item-text sidebar-link text-start collapsed" data-bs-toggle="collapse" data-bs-target="#quarto-sidebar-section-2" role="navigation" aria-expanded="false">
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<span class="menu-text">Anforderungskatalog für die Dokumentation von Forschungssoftware (Digital Humanities)</span></a>
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<span class="menu-text">Case Study: Local LLM-Based NER with n8n and Ollama</span></a>
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<span class="menu-text">RAG für eine Obsidian-Wissensdatenbank: Technische Ansätze</span></a>
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<span class="menu-text">Talks und Posts zu Haskell</span></a>
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<a href="../../Coding/Haskell/FFPiH.html" class="sidebar-item-text sidebar-link active">
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<span class="menu-text">Fortgeschrittene funktionale Programmierung in Haskell</span></a>
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<div class="sidebar-item-container">
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<a href="../../Coding/Haskell/Lenses.html" class="sidebar-item-text sidebar-link">
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<h1 class="title">Fortgeschrittene funktionale Programmierung in Haskell</h1>
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<p class="date">January 1, 2018</p>
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<p>FFPiH ist eine Vorlesung, die ich zusammen mit einem Kommilitonen im Sommer 2015 erstmals erstellt und gehalten haben.</p>
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<p>Insgesamt haben wir die Vorlesung 3x gehalten, wobei von der ersten zur zweiten Iteration der Inhalt massiv überarbeitet wurde und bei der Iteration von der zweiten zur dritten Vorlesung die Übungen komplett neu erstellt wurden.</p>
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<p>Die gesamten Übungen sind unter anderem in der FFPiH-Organisation in meinem gitea hinterlegt: <a href="https://gitea.dresselhaus.cloud/FFPiH">https://gitea.dresselhaus.cloud/FFPiH</a></p>
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<p>Einige der aktualisierten Übungen sind privat geschaltet, da diese iterativ aufeinander aufbauen und jeweils die Musterlösung der vorherigen enthalten.</p>
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<h2 class="anchored" data-anchor-id="aufbau-der-vorlesung">Aufbau der Vorlesung</h2>
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<p>Vorausgesetzt wurde, dass die Studierenden das erste Semester abgeschlossen hatten und somit bereits leichte Grundlagen in Haskell kannten (aber z.b. Dinge wie Functor/Applicative/Monad noch nicht <em>wirklich</em> erklärt bekommen haben).</p>
|
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<p>Stück für Stück werden die Studis dann zunächst in abstrakte Konstrukte eingeführt, aber diese werden dann schnell in die Praxis umgesetzt. Etwa mit dem Schreiben eines eigenen Parsers.</p>
|
||
<p>Schlussendlich gibt es dann einen “Rundumschlag” durch die gesamte Informatik. Erstellung eines Spieles (auf basis einer kleinen Grundlage), erstellung von WebApps mit Yesod, Parallelisierung und Nebenläufigkeit für rechenintensive Anwendungen inkl. synchronisation mittels STM.</p>
|
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<p>Optional gab es weitere Übungen zu dingen wie “verteiltes Rechnen”.</p>
|
||
<p>Ziel hierbei war nicht, diese ganzen Themen in der Tiefe beizubringen, sondern aufzuzeigen, wie sie sehr schnell abstrakte Konstrukte, die ihnen ggf. 3 Semester später erst begegnen bugfrei benutzen können, da Haskell hier in sehr vielen Fällen einfach nur die “richtige” Lösung kompilieren lässt und alle gängigen Fallen schlicht ausschließt. Beispiel ist z.b. STM innerhalb von STM, Mischen von DB-Monade, Handler-Monade und Template-Engine in Yesod, Process () statt IO () in der Nutzung von CloudHaskell, etc. pp.</p>
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<h2 class="anchored" data-anchor-id="studentisches-feedback">Studentisches Feedback</h2>
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<p>Sehr gutes Feedback von den Studenten bekamen wir insbesondere für Übungen wie:</p>
|
||
<p><a href="https://gitea.dresselhaus.cloud/FFPiH/uebung2017_2/src/branch/master/src/Aufgabe2.hs">Übung 2, Aufgabe 2</a>, weil hier durch “einfaches” umformen hin zu Abstraktionen und mit den Regeln dieser im ersten Fall die Laufzeit (vor Compileroptimierungen) von O(n²) auf O(0) ändert.</p>
|
||
<p><a href="https://gitea.dresselhaus.cloud/FFPiH/uebung2017-4">Übung 4</a>, welche ein komplett fertigen (sehr rudimentären und simplen) Dungeon-Crawler bereitstellt, der “nur” 1-2 bugs hat und “wie ein echtes Projekt” erweitert werden muss. Diese Übung hat sich dann über 4 weitere Übungen gestreckt, wobei folgende Aufgaben gelöst werden müssen:</p>
|
||
<ul>
|
||
<li>Einarbeitung in QuickCheck zur Behebung eines Bugs im Test</li>
|
||
<li>Umschreiben von explizitem Argument-Passing hin zu Monad-Transformers mit stateful <a href="../../Coding/Haskell/Lenses.html">Lenses</a></li>
|
||
<li>Continuation-Basierendes Event-System</li>
|
||
<li>Hinzufügen eines Parsers für Level, Items & deren Effekte und implementation dieser</li>
|
||
<li>Ändern des GUI-Parts von CLI auf 2D GL mittels gloss</li>
|
||
<li>Ändern von <code>StateT World</code> auf <code>RWST GameConfig Log World</code> und somit nutzen von individuellen Konfigurationen für z.b. Keybindings</li>
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var links = window.document.querySelectorAll('a[href]:not(.nav-link):not(.navbar-brand):not(.toc-action):not(.sidebar-link):not(.sidebar-item-toggle):not(.pagination-link):not(.no-external):not([aria-hidden]):not(.dropdown-item):not(.quarto-navigation-tool):not(.about-link)');
|
||
for (var i=0; i<links.length; i++) {
|
||
const link = links[i];
|
||
if (!isInternal(link.href)) {
|
||
// undo the damage that might have been done by quarto-nav.js in the case of
|
||
// links that we want to consider external
|
||
if (link.dataset.originalHref !== undefined) {
|
||
link.href = link.dataset.originalHref;
|
||
}
|
||
// target, if specified
|
||
link.setAttribute("target", "_blank");
|
||
if (link.getAttribute("rel") === null) {
|
||
link.setAttribute("rel", "noopener");
|
||
}
|
||
// default icon
|
||
link.classList.add("external");
|
||
}
|
||
}
|
||
function tippyHover(el, contentFn, onTriggerFn, onUntriggerFn) {
|
||
const config = {
|
||
allowHTML: true,
|
||
maxWidth: 500,
|
||
delay: 100,
|
||
arrow: false,
|
||
appendTo: function(el) {
|
||
return el.parentElement;
|
||
},
|
||
interactive: true,
|
||
interactiveBorder: 10,
|
||
theme: 'quarto',
|
||
placement: 'bottom-start',
|
||
};
|
||
if (contentFn) {
|
||
config.content = contentFn;
|
||
}
|
||
if (onTriggerFn) {
|
||
config.onTrigger = onTriggerFn;
|
||
}
|
||
if (onUntriggerFn) {
|
||
config.onUntrigger = onUntriggerFn;
|
||
}
|
||
window.tippy(el, config);
|
||
}
|
||
const noterefs = window.document.querySelectorAll('a[role="doc-noteref"]');
|
||
for (var i=0; i<noterefs.length; i++) {
|
||
const ref = noterefs[i];
|
||
tippyHover(ref, function() {
|
||
// use id or data attribute instead here
|
||
let href = ref.getAttribute('data-footnote-href') || ref.getAttribute('href');
|
||
try { href = new URL(href).hash; } catch {}
|
||
const id = href.replace(/^#\/?/, "");
|
||
const note = window.document.getElementById(id);
|
||
if (note) {
|
||
return note.innerHTML;
|
||
} else {
|
||
return "";
|
||
}
|
||
});
|
||
}
|
||
const xrefs = window.document.querySelectorAll('a.quarto-xref');
|
||
const processXRef = (id, note) => {
|
||
// Strip column container classes
|
||
const stripColumnClz = (el) => {
|
||
el.classList.remove("page-full", "page-columns");
|
||
if (el.children) {
|
||
for (const child of el.children) {
|
||
stripColumnClz(child);
|
||
}
|
||
}
|
||
}
|
||
stripColumnClz(note)
|
||
if (id === null || id.startsWith('sec-')) {
|
||
// Special case sections, only their first couple elements
|
||
const container = document.createElement("div");
|
||
if (note.children && note.children.length > 2) {
|
||
container.appendChild(note.children[0].cloneNode(true));
|
||
for (let i = 1; i < note.children.length; i++) {
|
||
const child = note.children[i];
|
||
if (child.tagName === "P" && child.innerText === "") {
|
||
continue;
|
||
} else {
|
||
container.appendChild(child.cloneNode(true));
|
||
break;
|
||
}
|
||
}
|
||
if (window.Quarto?.typesetMath) {
|
||
window.Quarto.typesetMath(container);
|
||
}
|
||
return container.innerHTML
|
||
} else {
|
||
if (window.Quarto?.typesetMath) {
|
||
window.Quarto.typesetMath(note);
|
||
}
|
||
return note.innerHTML;
|
||
}
|
||
} else {
|
||
// Remove any anchor links if they are present
|
||
const anchorLink = note.querySelector('a.anchorjs-link');
|
||
if (anchorLink) {
|
||
anchorLink.remove();
|
||
}
|
||
if (window.Quarto?.typesetMath) {
|
||
window.Quarto.typesetMath(note);
|
||
}
|
||
if (note.classList.contains("callout")) {
|
||
return note.outerHTML;
|
||
} else {
|
||
return note.innerHTML;
|
||
}
|
||
}
|
||
}
|
||
for (var i=0; i<xrefs.length; i++) {
|
||
const xref = xrefs[i];
|
||
tippyHover(xref, undefined, function(instance) {
|
||
instance.disable();
|
||
let url = xref.getAttribute('href');
|
||
let hash = undefined;
|
||
if (url.startsWith('#')) {
|
||
hash = url;
|
||
} else {
|
||
try { hash = new URL(url).hash; } catch {}
|
||
}
|
||
if (hash) {
|
||
const id = hash.replace(/^#\/?/, "");
|
||
const note = window.document.getElementById(id);
|
||
if (note !== null) {
|
||
try {
|
||
const html = processXRef(id, note.cloneNode(true));
|
||
instance.setContent(html);
|
||
} finally {
|
||
instance.enable();
|
||
instance.show();
|
||
}
|
||
} else {
|
||
// See if we can fetch this
|
||
fetch(url.split('#')[0])
|
||
.then(res => res.text())
|
||
.then(html => {
|
||
const parser = new DOMParser();
|
||
const htmlDoc = parser.parseFromString(html, "text/html");
|
||
const note = htmlDoc.getElementById(id);
|
||
if (note !== null) {
|
||
const html = processXRef(id, note);
|
||
instance.setContent(html);
|
||
}
|
||
}).finally(() => {
|
||
instance.enable();
|
||
instance.show();
|
||
});
|
||
}
|
||
} else {
|
||
// See if we can fetch a full url (with no hash to target)
|
||
// This is a special case and we should probably do some content thinning / targeting
|
||
fetch(url)
|
||
.then(res => res.text())
|
||
.then(html => {
|
||
const parser = new DOMParser();
|
||
const htmlDoc = parser.parseFromString(html, "text/html");
|
||
const note = htmlDoc.querySelector('main.content');
|
||
if (note !== null) {
|
||
// This should only happen for chapter cross references
|
||
// (since there is no id in the URL)
|
||
// remove the first header
|
||
if (note.children.length > 0 && note.children[0].tagName === "HEADER") {
|
||
note.children[0].remove();
|
||
}
|
||
const html = processXRef(null, note);
|
||
instance.setContent(html);
|
||
}
|
||
}).finally(() => {
|
||
instance.enable();
|
||
instance.show();
|
||
});
|
||
}
|
||
}, function(instance) {
|
||
});
|
||
}
|
||
let selectedAnnoteEl;
|
||
const selectorForAnnotation = ( cell, annotation) => {
|
||
let cellAttr = 'data-code-cell="' + cell + '"';
|
||
let lineAttr = 'data-code-annotation="' + annotation + '"';
|
||
const selector = 'span[' + cellAttr + '][' + lineAttr + ']';
|
||
return selector;
|
||
}
|
||
const selectCodeLines = (annoteEl) => {
|
||
const doc = window.document;
|
||
const targetCell = annoteEl.getAttribute("data-target-cell");
|
||
const targetAnnotation = annoteEl.getAttribute("data-target-annotation");
|
||
const annoteSpan = window.document.querySelector(selectorForAnnotation(targetCell, targetAnnotation));
|
||
const lines = annoteSpan.getAttribute("data-code-lines").split(",");
|
||
const lineIds = lines.map((line) => {
|
||
return targetCell + "-" + line;
|
||
})
|
||
let top = null;
|
||
let height = null;
|
||
let parent = null;
|
||
if (lineIds.length > 0) {
|
||
//compute the position of the single el (top and bottom and make a div)
|
||
const el = window.document.getElementById(lineIds[0]);
|
||
top = el.offsetTop;
|
||
height = el.offsetHeight;
|
||
parent = el.parentElement.parentElement;
|
||
if (lineIds.length > 1) {
|
||
const lastEl = window.document.getElementById(lineIds[lineIds.length - 1]);
|
||
const bottom = lastEl.offsetTop + lastEl.offsetHeight;
|
||
height = bottom - top;
|
||
}
|
||
if (top !== null && height !== null && parent !== null) {
|
||
// cook up a div (if necessary) and position it
|
||
let div = window.document.getElementById("code-annotation-line-highlight");
|
||
if (div === null) {
|
||
div = window.document.createElement("div");
|
||
div.setAttribute("id", "code-annotation-line-highlight");
|
||
div.style.position = 'absolute';
|
||
parent.appendChild(div);
|
||
}
|
||
div.style.top = top - 2 + "px";
|
||
div.style.height = height + 4 + "px";
|
||
div.style.left = 0;
|
||
let gutterDiv = window.document.getElementById("code-annotation-line-highlight-gutter");
|
||
if (gutterDiv === null) {
|
||
gutterDiv = window.document.createElement("div");
|
||
gutterDiv.setAttribute("id", "code-annotation-line-highlight-gutter");
|
||
gutterDiv.style.position = 'absolute';
|
||
const codeCell = window.document.getElementById(targetCell);
|
||
const gutter = codeCell.querySelector('.code-annotation-gutter');
|
||
gutter.appendChild(gutterDiv);
|
||
}
|
||
gutterDiv.style.top = top - 2 + "px";
|
||
gutterDiv.style.height = height + 4 + "px";
|
||
}
|
||
selectedAnnoteEl = annoteEl;
|
||
}
|
||
};
|
||
const unselectCodeLines = () => {
|
||
const elementsIds = ["code-annotation-line-highlight", "code-annotation-line-highlight-gutter"];
|
||
elementsIds.forEach((elId) => {
|
||
const div = window.document.getElementById(elId);
|
||
if (div) {
|
||
div.remove();
|
||
}
|
||
});
|
||
selectedAnnoteEl = undefined;
|
||
};
|
||
// Handle positioning of the toggle
|
||
window.addEventListener(
|
||
"resize",
|
||
throttle(() => {
|
||
elRect = undefined;
|
||
if (selectedAnnoteEl) {
|
||
selectCodeLines(selectedAnnoteEl);
|
||
}
|
||
}, 10)
|
||
);
|
||
function throttle(fn, ms) {
|
||
let throttle = false;
|
||
let timer;
|
||
return (...args) => {
|
||
if(!throttle) { // first call gets through
|
||
fn.apply(this, args);
|
||
throttle = true;
|
||
} else { // all the others get throttled
|
||
if(timer) clearTimeout(timer); // cancel #2
|
||
timer = setTimeout(() => {
|
||
fn.apply(this, args);
|
||
timer = throttle = false;
|
||
}, ms);
|
||
}
|
||
};
|
||
}
|
||
// Attach click handler to the DT
|
||
const annoteDls = window.document.querySelectorAll('dt[data-target-cell]');
|
||
for (const annoteDlNode of annoteDls) {
|
||
annoteDlNode.addEventListener('click', (event) => {
|
||
const clickedEl = event.target;
|
||
if (clickedEl !== selectedAnnoteEl) {
|
||
unselectCodeLines();
|
||
const activeEl = window.document.querySelector('dt[data-target-cell].code-annotation-active');
|
||
if (activeEl) {
|
||
activeEl.classList.remove('code-annotation-active');
|
||
}
|
||
selectCodeLines(clickedEl);
|
||
clickedEl.classList.add('code-annotation-active');
|
||
} else {
|
||
// Unselect the line
|
||
unselectCodeLines();
|
||
clickedEl.classList.remove('code-annotation-active');
|
||
}
|
||
});
|
||
}
|
||
const findCites = (el) => {
|
||
const parentEl = el.parentElement;
|
||
if (parentEl) {
|
||
const cites = parentEl.dataset.cites;
|
||
if (cites) {
|
||
return {
|
||
el,
|
||
cites: cites.split(' ')
|
||
};
|
||
} else {
|
||
return findCites(el.parentElement)
|
||
}
|
||
} else {
|
||
return undefined;
|
||
}
|
||
};
|
||
var bibliorefs = window.document.querySelectorAll('a[role="doc-biblioref"]');
|
||
for (var i=0; i<bibliorefs.length; i++) {
|
||
const ref = bibliorefs[i];
|
||
const citeInfo = findCites(ref);
|
||
if (citeInfo) {
|
||
tippyHover(citeInfo.el, function() {
|
||
var popup = window.document.createElement('div');
|
||
citeInfo.cites.forEach(function(cite) {
|
||
var citeDiv = window.document.createElement('div');
|
||
citeDiv.classList.add('hanging-indent');
|
||
citeDiv.classList.add('csl-entry');
|
||
var biblioDiv = window.document.getElementById('ref-' + cite);
|
||
if (biblioDiv) {
|
||
citeDiv.innerHTML = biblioDiv.innerHTML;
|
||
}
|
||
popup.appendChild(citeDiv);
|
||
});
|
||
return popup.innerHTML;
|
||
});
|
||
}
|
||
}
|
||
});
|
||
</script>
|
||
</div> <!-- /content -->
|
||
|
||
|
||
|
||
|
||
</body></html> |