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<!DOCTYPE html> <html> <body> <h2>JavaScript Arrays</h2> <p>The prototype constructor allows you to add new properties or methods to the Array() object.</p> <p id="demo"></p> <script> // Add a new method Array.prototype.myUcase = function() { for (let i = 0; i < this.length; i++) { this[i] = this[i].toUpperCase(); } }; // Use the method on any array const fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.myUcase(); document.getElementById("demo").innerHTML = fruits; </script> </body> </html>