wdsacademy: custome method using javascript

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Saturday, August 23, 2025

<!DOCTYPE html>

<html>

<head>

<title>Custom Prototype Method</title>

</head>

<body>

<h2>Prototype Sum Method</h2>

<button onclick="calculate()">Click to Calculate</button>

// ✅ Add custom method using prototype

Number.prototype.add = function(num) {

return this + num;

};

function calculate() {

let result = (10).add(20); // using custom method

alert("The sum is: " + result);

}

</script>

</body>

</html>