Reflection and Extend in javascript

Something Like that:
Reflection and Extend

What is Reflection in javascript
An Object can look at itself, listing and changing its properties and methods.

JS

var person = {
	firstname: 'Default',
	lastname: 'Default',
	getFullName: function(){
		return this.firstname + ' ' + this.lastname;
	}
}

var john = {
	firstname: 'John',
	lastname: 'Doe'
}

john.__proto__ = person;

for(var prop in john){
    if(john.hasOwnProperty(prop)){
      document.write(prop + ': ' + john[prop] + '
');
    }
}

[codepen_embed height=”265″ theme_id=”0″ slug_hash=”PKRgaO” default_tab=”result” user=”pradeepanvi”]See the Pen Reflection in javascript by Pradeep Kumar (@pradeepanvi) on CodePen.[/codepen_embed]

Now you can see

firstname: John
lastname: Doe

Extend (use underscore.js)

JS

var john = {
	firstname: 'John',
	lastname: 'Doe'
}

var jane = {
    address: '111 Main St.',
    getFormalFullName: function(){
        return this.lastname + ', ' + this.firstname;
    }
}

var jim = {
    getFirstName: function(){
        return firstname;
    }
}

_.extend(john, jane, jim);
document.write(john);

[codepen_embed height=”265″ theme_id=”0″ slug_hash=”qXowLN” default_tab=”result” user=”pradeepanvi”]See the Pen Extend in javascript by Pradeep Kumar (@pradeepanvi) on CodePen.[/codepen_embed]

Now you can see

[object Object]