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//----------------------------------
// Prototype Demo
// ---------------------------------
// Define functional object constructor called Quadrilateral
// with width and height as parameters.
var Quadrilateral = function(width, height) {
this.width = width;
this.height = height;
return this;
}
// Define method to return width.
Quadrilateral.prototype.getWidth = function() {
return this.width;
}
// Define new object of type Quadrilateral.
var mysquare = new Quadrilateral(4,4);
// Call the getWidth method.
console.log(mysquare.getWidth()); // returns 4
// Define method to set dimensions.
Quadrilateral.prototype.setDimensions = function(width, height) {
this.width = width;
this.height = height;
return this;
}
// Set the dimensions of mysquare.
mysquare.setDimensions(7,7);
// Output mysquare width.
console.log(mysquare.getWidth()); // returns 7
// Define functional object constructor called Rectangle
// with width and height as parameters.
var Rectangle = function(width, height){
this.width = width;
this.height = height;
return this;
};
// Inherit methods and properties from Quadrilateral object.
Rectangle.prototype = new Quadrilateral();
// Define new object of type Rectangle.
var myrectangle = new Rectangle(6,2);
// Output myrectangle width.
console.log(myrectangle.getWidth()); // returns 6
// Test Quadrilateral and Rectangle method properties
console.log(Quadrilateral.prototype.hasOwnProperty('getWidth')); // returns true
console.log(Rectangle.prototype.hasOwnProperty('getWidth')); // returns false
// Test mysquare inheritance
console.log(mysquare instanceof Quadrilateral); // returns true
console.log(mysquare instanceof Rectangle); //return false
// Test myrectangle inheritance
console.log(myrectangle instanceof Quadrilateral); // returns true
console.log(myrectangle instanceof Rectangle); //return true
// Test inheritance from global Object object
console.log(Quadrilateral instanceof Object); // returns true
console.log(Rectangle instanceof Object); //return true
console.log(mysquare instanceof Object); // returns true
console.log(myrectangle instanceof Object); //return true
// Check if a global method exists, if not create our own
if (!Array.prototype.forEach) {
Array.prototype.forEach = function(fn, scope) {
for(var i = 0, len = this.length; i < len; ++i) {
fn.call(scope, this[i], i, this);
}
}
}
//EOF
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