Object Property Accessors ?

Object Property Accessors provide access to an object’s properties by using the dot notation or the bracket notation.

There are two ways to access a property of an object:
• Using square bracket notation, for example person[‘occupation’]
• Using the dot notation, for example person.occupation

Let’s take this object:

var person  = {
  name: 'dileep',
  occupation: 'programmer'
};

Accessing a property with the dot notation:

person.name;
"dileep"

Accessing a property with the bracket notation:

person['occupation'];
"programmer"

Accessing a non-existing property returns undefined :

 'Hair color is ' + hero.hair_color;
 "Hair color is undefined"

More Info : Properties Accessors

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