Prototype & Inheritance in JavaScript

Oct 24, 2013Download as pptx, pdf

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The document discusses prototypes and inheritance in JavaScript. It explains that prototypes allow functions to serve as constructors that return objects, and that prototype properties and methods are available to all objects created with a constructor. It provides examples of using the prototype property to add properties and methods like MaxValue and SayHello that are then accessible via the myFoo object instance. Inheritance in JavaScript can be achieved through constructor functions and their prototypes.

Prototype & Inheritance
in
JavaScript

C# Corner – 21st September

Sunny Kumar

Prototypes in JavaScript
• What is Prototype?
• Augmenting the Prototype
• Overwriting the Prototype
• Use of Prototype
• Prototype Chain

Inheritance in JavaScript
• Various ways of Inheritance in JavaScript.

Sneak Peek into past…

Functions

- are objects.
- returns Value.
- can return objects, including other functions.
- they have properties.
- they have methods.
- can be copied, deleted, augmented.
- special feature: Invokable.
- when invoked with new keyword, returns an object named
this , can be modified before it’s returned.

Sneak Peek into past…

Constructor Functions
var Person = function(name) {
this.name = name;
this.getName = function() {
return this.name;
};
};
var me = new Person(“Sunny");
me.getName(); // “Sunny"

• prototype is a property of function object.
• Only function Objects can have prototype property.

var foo = function(){};
console.log(foo.prototype);
Object {} //output

Var foo=function(){};
Var myFoo = new foo(); //instantiates an object of foo.
foo.prototype.MaxValue=100;
foo.prototype.SayHello=function(name){
return “Hi “+name+” !”;
}
myFoo.SayHello(“Kumar”); // “Hi Kumar !”

var Person = function(name) {
this.name = name;
};
Person.prototype.say = function(){
return this.name;
};

var dude = new Person('dude');

dude.name; // "dude“
dude.say(); // "dude“ same result

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Prototype & Inheritance in JavaScript

1. Prototype & Inheritance in JavaScript C# Corner – 21st September Sunny Kumar

2. Prototypes in JavaScript • What is Prototype? • Augmenting the Prototype • Overwriting the Prototype • Use of Prototype • Prototype Chain Inheritance in JavaScript • Various ways of Inheritance in JavaScript.

3. Sneak Peek into past… Functions - are objects. - returns Value. - can return objects, including other functions. - they have properties. - they have methods. - can be copied, deleted, augmented. - special feature: Invokable. - when invoked with new keyword, returns an object named this , can be modified before it’s returned.

4. Sneak Peek into past… Constructor Functions var Person = function(name) { this.name = name; this.getName = function() { return this.name; }; }; var me = new Person(“Sunny"); me.getName(); // “Sunny"

7. • prototype is a property of function object. • Only function Objects can have prototype property.

8. var foo = function(){}; console.log(foo.prototype); Object {} //output

9. Var foo=function(){}; Var myFoo = new foo(); //instantiates an object of foo. foo.prototype.MaxValue=100; foo.prototype.SayHello=function(name){ return “Hi “+name+” !”; } myFoo.SayHello(“Kumar”); // “Hi Kumar !”

10. foo.prototype={x:1,y:2}

11. var Person = function(name) { this.name = name; }; Person.prototype.say = function(){ return this.name; };

12. var dude = new Person('dude'); dude.name; // "dude“ dude.say(); // "dude“ same result

Prototype & Inheritance in JavaScript

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