Different ways to create javascript object

All about Javascript Object Creation

// Each of the following options will create a new empty object:
var newObject = {}; // or
var newObject = Object.create(null); // or
var newObject = new Object();

// four ways in which keys and values can then be assigned to an object
// ECMAScript 3 compatible approaches

// 1. Dot syntax
newObject.someKey = 'Hello World'; // Write properties
var key = newObject.someKey; // Access properties, only useful for valid property name

// 2. Square bracket syntax
newObject['someKey'] = 'Hello World'; // Write properties
var key = newObject['someKey']; // Access properties

// ECMAScript 5 only compatible approaches
// For more information see: http://kangax.github.com/es5-compat-table/

// 3. Object.defineProperty
Object.defineProperty(newObject, "someKey", {
  value: "for more control of the property's behavior",
  writable: true,
  enumerable: true,
  configurable: true
});

// If the above feels a little difficult to read, a short-hand could
// be written as follows:

var defineProp = function ( obj, key, value ){
config.value = value;
Object.defineProperty(obj, key, config);
}

// Create a new empty object
var man = Object.create(null);

// Populate the object with properties
defineProp( man, 'car', 'Delorean' );
defineProp( man, 'dob', '1981' );
defineProp( man, 'beard', false );

// 4. Object.defineProperties
Object.defineProperties(newObject, {
  "someKey": {
    value: "Hello World",
    writable: true
  },
  "anotherKey": {
    value: "Foo bar",
    writable: false
  }
});