Javascript Prototype

Prototype-based Object oriented language

• javascript is, different from java/c#(class-based ool), a prototype-based object oriented language
• js uses prototype to implement inheritance

Prototype

• every object in js has (at least) a prototype which has properties and methods

var date = new Date(); // Date.prototype && Object.prototype

• when a function is declared, it can be a constructor for an object using “new” keyword in front of it
• also, Prototype Object is created for the function and we can access to the Ojbect using “prototype” property of the function
• Prototype Object has constructor and __proto__(Prototype Link) property
• __proto__(Prototype Link) points to the ancestor’s Prototype Object

reference

• 프로토타입
• [Javascript] 프로토타입 이해하기