diff --git a/01_grundlagen/unterricht/tag10/04_ar-find.html b/01_grundlagen/unterricht/tag10/04_ar-find.html
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+++ b/01_grundlagen/unterricht/tag10/04_ar-find.html
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+<!doctype html>
+<html lang="de">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Array - ar.find()</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css" rel="stylesheet" />
+  </head>
+  <body>
+    <main>
+      <div class="container py-5">
+        <h1>Array - ar.find()</h1>
+        <p>
+          <a href="https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Array/find"
+            >ar.find()
+          </a>
+          - Die Methode <strong>find()</strong> gibt den Wert des Elements eines Arrays zurück, welches
+          <strong>als erstes</strong> die Bedingung einer bereitgestellten Testfunktion erfüllt. Andernfalls wird
+          <strong>undefined</strong> zurückgegeben.
+        </p>
+        <div class="alert alert-warning">Side-effect-free</div>
+        <div class="alert alert-secondary output"></div>
+      </div>
+    </main>
+    <script>
+      'use strict';
+
+      const outputEl = document.querySelector('.output');
+
+      const winners = ['Heribert', 'Friedlinde', 'Tusnelda', 'Oswine', 'Ladislaus'];
+
+      const names = [
+        'Florian', //
+        'Benjamin',
+        'Christian',
+        'Stefan',
+        'Philippe',
+        'Kaumon',
+      ];
+
+      // Array Methode - ar.find((currentValue [,index] [,array]) => {})
+
+      const foundName = names.find((name) => {
+        return name.toLowerCase() === 'philippe';
+      });
+
+      console.log(foundName); // => 'Philippe'
+
+      outputEl.innerHTML = `${foundName}`;
+
+      console.log(
+        names.find((name) => {
+          return name.toLowerCase() === 'Boris';
+        }),
+      ); // => undefined <- bei keinem Treffer
+
+      // Optionale Parameter von Find ===================
+
+      // Array Methode - ar.find((currentValue, idx, arr) => {})
+      names.find((name, idx, ar) => {
+        console.log(`Name: ${name}, Index: ${idx}, Array: ${ar.join(', ')}`);
+      });
+    </script>
+  </body>
+</html>
diff --git a/01_grundlagen/unterricht/tag10/05_ar-find-index.html b/01_grundlagen/unterricht/tag10/05_ar-find-index.html
new file mode 100644
index 0000000..b24bd57
--- /dev/null
+++ b/01_grundlagen/unterricht/tag10/05_ar-find-index.html
@@ -0,0 +1,73 @@
+<!doctype html>
+<html lang="de">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Array - ar.findIndex()</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css" rel="stylesheet" />
+  </head>
+  <body>
+    <main>
+      <div class="container py-5">
+        <h1>Array - ar.findIndex()</h1>
+        <p>
+          <a href="https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Array/findindex">
+            ar.findIndex()
+          </a>
+        </p>
+
+        <p>
+          - Die Methode <strong>findIndex()</strong> gibt den Index des Elements eines Arrays zurück, welches
+          <strong>als erstes</strong> die Bedingung einer bereitgestellten Testfunktion erfüllt. Andernfalls wird
+          <strong>-1</strong> zurückgegeben.
+        </p>
+        <div class="alert alert-warning">Side-effect-free</div>
+        <div class="alert alert-secondary output"></div>
+      </div>
+    </main>
+    <script>
+      'use strict';
+
+      const outputEl = document.querySelector('.output');
+
+      const winners = ['Heribert', 'Friedlinde', 'Tusnelda', 'Oswine', 'Ladislaus'];
+
+      const names = [
+        'Florian', //
+        'Benjamin',
+        'Christian',
+        'Stefan',
+        'Philippe',
+        'Kaumon',
+      ];
+
+      // Array Methode - ar.findIndex((currentValue [,index] [,array]) => {})
+
+      const foundIdx = names.findIndex((name) => {
+        return name.toLowerCase() === 'philippe';
+      });
+
+      const foundIdx2 = names.indexOf('Philippe');
+
+      console.log(foundIdx); // => 4
+      console.log(foundIdx2); // => 4
+
+      outputEl.innerHTML = `${foundIdx}`;
+
+      console.log(
+        names.findIndex((name) => {
+          return name.toLowerCase() === 'Boris';
+        }),
+      ); // => -1 <- bei keinem Treffer
+
+      console.log(names.indexOf('Boris')); // => -1
+
+      // Optionale Parameter von findIndex ===================
+
+      // Array Methode - ar.findIndex((currentValue, idx, arr) => {})
+      names.findIndex((name, idx, ar) => {
+        console.log(`Name: ${name}, Index: ${idx}, Array: ${ar.join(', ')}`);
+      });
+    </script>
+  </body>
+</html>