new class js -advanced
This commit is contained in:
Philippe Torrel
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Code,Short Description,Tagline,Quantity,Price
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MUG0007,coffee mug with LCD level indicator,never again reach for the empty mug,20,49.90
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MUG0013,coffee mug with bluetooth-connected coffee grounds scanner for automatized fortune telling,put the smart into coffee reading,20,99.90
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OFF3145,pen with pre-warmed ink (tested on the South Pole),the pen is mightier than the cold,50,29.90
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COM1001,ambidextrous computer mouse,end the dictate of left and right,10,19.90
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COM0404,Easter egg themed webcam for your monitor,put an Easter egg on hardware too,20,149.90
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COM0001,Vulcan language vi cheatsheet,learn vi and Vulcan at the same time,3,9.90
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COM1536,Klingon language emacs cheatsheet,learn emacs and Klingon at the same time,50,9.90
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MOB0555,smartphone case with built-in screen,never miss a message,20,39.90
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const fs = require('fs');
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const zlib = require('zlib');
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const STOCK_WARN_AMOUNT = 5;
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// Function to convert a CSV record to HTML
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const recordToHTML = (record) => {
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const fields = record.split(',');
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const html = `<li class="list-group-item">
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<h2>${fields[1]}</h2>
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<p>${fields[2]}</p>
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<p><strong>Price:</strong> EUR ${fields[4]}</p>
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${
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Number(fields[3]) <= STOCK_WARN_AMOUNT
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? '<p class="alert alert-warning">Last items in stock!</p>'
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: ''
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}
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</li>`;
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return html;
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};
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// Asynchronous version
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fs.readFile('data/products.csv', 'UTF8', (err, data) => {
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if (err) {
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console.error(err);
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return;
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}
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const products = data.split('\n');
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products.shift(); // remove header
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const entries = products.filter((row) => row !== '').map(recordToHTML);
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writeToFile(entries);
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});
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const writeToFile = (entries) => {
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const headerStr = `<!DOCTYPE html>
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<html lang="de">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Products</title>
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<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" />
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</head>
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<body>
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<main>
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<div class="container py-5">`;
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const footerStr = `</div>
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</main>
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<script>
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'use strict';
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</script>
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</body>
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</html>`;
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const html = `${headerStr}
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<ul class="list-group">
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${entries.join('')}
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</ul>${footerStr}`;
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try {
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const compressed = zlib.gzipSync(html);
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fs.writeFileSync('data/products.html.gz', compressed);
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} catch (err) {
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console.error(err);
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return;
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}
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console.log('file written');
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};
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@@ -0,0 +1,9 @@
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Code,Short Description,Tagline,Quantity,Price
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MUG0007,coffee mug with LCD level indicator,never again reach for the empty mug,20,49.90
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MUG0013,coffee mug with bluetooth-connected coffee grounds scanner for automatized fortune telling,put the smart into coffee reading,20,99.90
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OFF3145,pen with pre-warmed ink (tested on the South Pole),the pen is mightier than the cold,50,29.90
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COM1001,ambidextrous computer mouse,end the dictate of left and right,10,19.90
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COM0404,Easter egg themed webcam for your monitor,put an Easter egg on hardware too,20,149.90
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COM0001,Vulcan language vi cheatsheet,learn vi and Vulcan at the same time,3,9.90
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COM1536,Klingon language emacs cheatsheet,learn emacs and Klingon at the same time,50,9.90
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MOB0555,smartphone case with built-in screen,never miss a message,20,39.90
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@@ -0,0 +1,61 @@
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<!DOCTYPE html>
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<html lang="de">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Products</title>
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<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" />
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</head>
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<body>
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<main>
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<div class="container py-5">
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<ul class="list-group">
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<li class="list-group-item">
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<h2>coffee mug with LCD level indicator</h2>
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<p>never again reach for the empty mug</p>
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<p><strong>Price:</strong> EUR 49.90</p>
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</li><li class="list-group-item">
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<h2>coffee mug with bluetooth-connected coffee grounds scanner for automatized fortune telling</h2>
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<p>put the smart into coffee reading</p>
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<p><strong>Price:</strong> EUR 99.90</p>
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</li><li class="list-group-item">
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<h2>pen with pre-warmed ink (tested on the South Pole)</h2>
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<p>the pen is mightier than the cold</p>
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<p><strong>Price:</strong> EUR 29.90</p>
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</li><li class="list-group-item">
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<h2>ambidextrous computer mouse</h2>
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<p>end the dictate of left and right</p>
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<p><strong>Price:</strong> EUR 19.90</p>
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</li><li class="list-group-item">
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<h2>Easter egg themed webcam for your monitor</h2>
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<p>put an Easter egg on hardware too</p>
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<p><strong>Price:</strong> EUR 149.90</p>
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</li><li class="list-group-item">
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<h2>Vulcan language vi cheatsheet</h2>
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<p>learn vi and Vulcan at the same time</p>
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<p><strong>Price:</strong> EUR 9.90</p>
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<p class="alert alert-warning">Last items in stock!</p>
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</li><li class="list-group-item">
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<h2>Klingon language emacs cheatsheet</h2>
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<p>learn emacs and Klingon at the same time</p>
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<p><strong>Price:</strong> EUR 9.90</p>
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</li><li class="list-group-item">
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<h2>smartphone case with built-in screen</h2>
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<p>never miss a message</p>
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<p><strong>Price:</strong> EUR 39.90</p>
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</li>
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</ul></div>
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</main>
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<script>
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'use strict';
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</script>
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</body>
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</html>
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Binary file not shown.
@@ -0,0 +1,9 @@
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const fs = require('fs');
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const zlib = require('zlib');
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const inputStream = fs.createReadStream('data/products.html');
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const outputStream = fs.createWriteStream('data/products.html.gz');
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inputStream.on('data', (data) => {
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outputStream.write(zlib.gzipSync(data));
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});
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@@ -0,0 +1,17 @@
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const crypto = require('crypto');
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const PASSWORD_LENGTH = 10;
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const s = '23456789abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ!.,;#$%/+*';
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const buf = crypto.randomBytes(PASSWORD_LENGTH);
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console.log(buf); // gibt ein Buffer Objekt zurück (z.B. <Buffer 90 7f 3d 1d 1f 7d 7d 7d 7d 7d>)
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const password = Array.from(buf);
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constole.log(password); // gibt ein Array zurück mit Werten zwischen 0 und 255 (z.B. [ 144, 127, 61, 29, 31, 125, 125, 125, 125, 125 ])
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password
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.map((byte) => s.charAt(byte % s.length)) // gibt ein Array zurück mit den Zeichen aus s (z.B. [ '3', '7', 'h', 'G', 'J', 'z', 'z', 'z', 'z', 'z' ])
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.join(''); // wandelt das Array in einen String um.
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console.log(password); // gibt das generierte Passwort zurück (z.B. '37hGJzzzzz')
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