Prototype

Prototype is basically an object - attached automatically to function.

• Can access by point to "prototype" property.
• Prototype object is shared between instances of an function.
• Can add any variable, function - property to prototype object any where after object created.

Example create function Scuti and instantiate object Scuti1 from Scuti. They will share the same prototype object.

• When access to properties, functions of object, firstly it will look at properties of object to find it, then if there is no property satisfied, it will look in to prototype of object to find, if existed that property will return.
• With prototype, it's able to create function or property after object construction. It's magic but often make confuse or hard to manage.

Example:

function Scuti has no method name getBoss but after create object scuti1, add method to Scuti. object scuti1 still can invoke method getBoss

• With prototype , we can implement inheritance. It's very important to do OOP with javascript.
• Consider about shared prototype. Should not add new properties or method via prototype in everywhere, it will make your program to be so messy.