Prototype & Inheritance in JavaScript

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What is prototype and how we use it to inherit the properties of an object in JavaScript.

What is prototype and how we use it to inherit the properties of an object in JavaScript.

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  • 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"
  • 5. • prototype is a property of function object. • Only function Objects can have prototype property.
  • 6. var foo = function(){}; console.log(foo.prototype); Object {} //output
  • 7. 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 !”
  • 8. foo.prototype={x:1,y:2}
  • 9. var Person = function(name) { this.name = name; }; Person.prototype.say = function(){ return this.name; };
  • 10. var dude = new Person('dude'); dude.name; // "dude“ dude.say(); // "dude“ same result