40 lines
1.3 KiB
HTML
40 lines
1.3 KiB
HTML
<!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>Übung 7: Rekursive Umkehrung eines Strings</title>
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<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/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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<div class="alert alert-primary">
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<h2>Übung 7: Rekursive Umkehrung eines Strings</h2>
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<p>Schreibe eine rekursive Funktion in JavaScript, die einen gegebenen String umkehrt.</p>
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</div>
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</div>
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</main>
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<script>
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'use strict';
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const reverseString = (str) => {
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if (str.length <= 1) {
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return '';
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}
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// console.log('str.slice(1): ', str.slice(1));
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// iwie kapier ich das mit den rückgabewarten von rekursiven funktionen noch net wirklich
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return reverseString(str.slice(1)) + str[0];
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// return ... <-- ("lo") + "l" <--- ("llo") + "e" <-- ("ello") + "h"
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};
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// Test cases
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console.log(reverseString('hello')); // => "olleh"
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console.log(reverseString('Recursion')); // => "noisruceR"
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console.log(reverseString('')); // => ""
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console.log(reverseString('A')); // => "A"
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</script>
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</body>
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</html>
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