function constructor without new - Node.js Object

Node.js examples for Object:Constructor

  1. HOME
  2. Node.js
  3. Object
  4. Constructor

Description

function constructor without new

Demo Code


function Rect(x, y, width, height) {
  this.x = x;/*from  ww  w .  j  a v  a2  s.c o  m*/
  this.y = y;
  this.width = width;
  this.height = height;
}

Rect.prototype.calcArea = function () {
  return this.width * this.height;
};
Rect.prototype.calcPerimeter = function () {
  return 2 * this.width + 2 * this.height;
};

var realRect = new Rect(45, 85, 55, 90);
var badRect = Rect(45, 85, 55, 90);

console.log('With new: ' + realRect.calcArea());
//throws exceptions because badRect is undefined
console.log('Without new: ' + badRect.calcArea());

Related Tutorials