commandments.html 11 KB

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  195. </head>
  196. <body>
  197. <div id="content" class="content">
  198. <h1 class="title">Commandments</h1>
  199. <div id="table-of-contents" role="doc-toc">
  200. <h2>Table of Contents</h2>
  201. <div id="text-table-of-contents" role="doc-toc">
  202. <ul>
  203. <li><a href="#commandment-11">1. 11 - The Eleventh Commandment - Accumulation of results or maintaining state</a></li>
  204. <li><a href="#commandment-12">2. 12 - The Twelfth Commandment - Avoiding of unchanging iteration arguments</a></li>
  205. <li><a href="#commandment-13">3. 13 - The Thirteenth Commandment - Usage of <code class="src src-scheme">(letrec ...)</code> or named <code class="src src-scheme">let</code> or inner <code class="src src-scheme">(define ...)</code></a></li>
  206. <li><a href="#commandment-14">4. 14 - The Fourteenth Commandment - Usage of <code class="src src-scheme">(call-with-current-continuation ...)</code></a></li>
  207. <li><a href="#commandment-15">5. 15 - The Fifteenth Commandment - Usage of <code class="src src-scheme">(let ...)</code></a></li>
  208. </ul>
  209. </div>
  210. </div>
  211. <div id="outline-container-commandment-11" class="outline-2">
  212. <h2 id="commandment-11"><span class="section-number-2">1.</span> 11 - The Eleventh Commandment - Accumulation of results or maintaining state</h2>
  213. <div class="outline-text-2" id="text-commandment-11">
  214. <blockquote>
  215. <p>
  216. Use additional arguments when a function needs to know what other arguments to the function have been like so far.
  217. </p>
  218. </blockquote>
  219. </div>
  220. </div>
  221. <div id="outline-container-commandment-12" class="outline-2">
  222. <h2 id="commandment-12"><span class="section-number-2">2.</span> 12 - The Twelfth Commandment - Avoiding of unchanging iteration arguments</h2>
  223. <div class="outline-text-2" id="text-commandment-12">
  224. <blockquote>
  225. <p>
  226. Use <code>(letrec ...)</code> to remove arguments that do not change for recursive application.
  227. </p>
  228. </blockquote>
  229. <p>
  230. However, in some Scheme dialects one can also use <code>define</code> in all or most contexts (definition contexts), so that one does not need to use <code>letrec</code>.
  231. </p>
  232. </div>
  233. </div>
  234. <div id="outline-container-commandment-13" class="outline-2">
  235. <h2 id="commandment-13"><span class="section-number-2">3.</span> 13 - The Thirteenth Commandment - Usage of <code class="src src-scheme">(letrec ...)</code> or named <code class="src src-scheme">let</code> or inner <code class="src src-scheme">(define ...)</code></h2>
  236. <div class="outline-text-2" id="text-commandment-13">
  237. <blockquote>
  238. <p>
  239. Use <code class="src src-scheme">(letrec ...)</code> to hide and to protect functions.
  240. </p>
  241. </blockquote>
  242. </div>
  243. </div>
  244. <div id="outline-container-commandment-14" class="outline-2">
  245. <h2 id="commandment-14"><span class="section-number-2">4.</span> 14 - The Fourteenth Commandment - Usage of <code class="src src-scheme">(call-with-current-continuation ...)</code></h2>
  246. <div class="outline-text-2" id="text-commandment-14">
  247. <blockquote>
  248. <p>
  249. Use <code class="src src-scheme">(letcc ...)</code> to return values abruptly and promptly.
  250. </p>
  251. </blockquote>
  252. <p>
  253. However, in Scheme dialects, it is called <code class="src src-scheme">(call-with-current-continuation ...)</code> instead. One could write a macro transforming it into <code class="src src-scheme">(letrec ...)</code> though.
  254. </p>
  255. </div>
  256. </div>
  257. <div id="outline-container-commandment-15" class="outline-2">
  258. <h2 id="commandment-15"><span class="section-number-2">5.</span> 15 - The Fifteenth Commandment - Usage of <code class="src src-scheme">(let ...)</code></h2>
  259. <div class="outline-text-2" id="text-commandment-15">
  260. <p>
  261. Use <code class="src src-scheme">(let ...)</code> to name the values of repeated expressions in a function definition if they may be evaluated twice for one and the same use of the function.
  262. </p>
  263. </div>
  264. </div>
  265. </div>
  266. <div id="postamble" class="status">
  267. <p class="date">Date: 2023-03-04 Sa 00:00</p>
  268. <p class="author">Author: Zelphir Kaltstahl</p>
  269. <p class="date">Created: 2023-03-05 So 13:36</p>
  270. <p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
  271. </div>
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