Creation of JavaScript object with Constructor

by dima_k

JavaScript

function Rectangle(a, b) {
    this.a = a;
    this.b = b;
    this.getPerimeter = function() {
        return 2*(this.a + this.b);
    };
}
var rectangle = new Rectangle(10,5);
alert(rectangle.constructor == Rectangle); // alerts true
alert(rectangle instanceof Rectangle); //alerts true