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<title>My Learning Website</title>
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<!--[if lt IE 9]>
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<![endif]-->
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</head>
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<body>
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<h1 class="courselink">JavaScript Essential Training</h1>
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<h2 class="lecturer">LinkedIn Learning : Morten Rand-Hendriksen</h2>
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<h1 class="episodetitle">Code Samples</h1>
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<article>
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<h2 class="sectiontitle">Code Sample 1</h2>
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<p>This is the JavaScript code for 08_10 in the exercise files. </p>
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<h2 class="sectiontitle">Callback Function</h2>
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<pre class="codesample">
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/**
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* Using a callback function.
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* @link https://developer.mozilla.org/en-US/docs/Glossary/Callback_function
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*/
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// Helper function to format currency numbers. Used by tipCalculator
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const formatter = (locale = "en-US", currency = "USD", value) => {
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let formattedValue = new Intl.NumberFormat(locale, {
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style: "currency",
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currency: currency,
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}).format(value);
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return formattedValue;
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};
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// Callback receives finalTip object, creates and outputs table on the DOM.
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const printHTML = (finalTip) => {
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const tipTable = document.createElement("table");
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tipTable.innerHTML = `
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<tr>
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<td>Sum before tip:</td>
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<td>${finalTip.sum}</td>
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</tr>
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<tr>
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<td>Tip percentage:</td>
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<td>${finalTip.percentage}</td>
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</tr>
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<tr>
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<td>Tip:</td>
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<td>${finalTip.tip}</td>
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</tr>
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<tr>
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<td>Total:</td>
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<td>${finalTip.total}</td>
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</tr>
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`;
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document.querySelector("main").append(tipTable);
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};
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// Create a finalTip object with all the data. Send it to the printHTML callback.
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const tipCalculator = (sum, percentage, locale, currency) => {
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let tip = sum * (percentage / 100);
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let total = sum + tip;
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const finalTip = {
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sum: formatter(locale, currency, sum),
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percentage: percentage + "%",
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tip: formatter(locale, currency, tip),
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total: formatter(locale, currency, total),
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};
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};
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tipCalculator(29.95, 18, "de-DE", "EUR");</pre>
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</article>
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<div class="btngroup">
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<button class="button" onclick="window.location.href='javascriptessentialtraining2021.html'">
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Course Contents
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</button>
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Web Development Page
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