JavaScript-kurs/prototypes.html at main · Nitjsefni7/JavaScript-kurs · GitHub

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<!DOCTYPE html>
<html>
<head>
	<title>Prototypes</title>
</head>
<body>

	<script type="text/javascript">

		//dodawanie metody do isntniejacego obiektu: nalezy dodac metode do prototype obiektu
		//w tym przypadku dodajemy funckje lastYear do prototype obiektu Date

		Date.prototype.lastYear = function () {return this.getFullYear() - 1}
		console.log(new Date().lastYear());

		//Person ma .prototype
		var Person = function(name, age) {
			this.name = name;
			this.age = age;
		}

		var p1 = new Person("Monia", 24)

		let arr = [1,2,3];
		Array.prototype.map = function () {
			let newArr = [];
			this.forEach(function(element, index){
				newArr.push(element + ' mapa');
			});
			return newArr;
		}

		console.log(arr.map());


	</script>

</body>
</html>