Object.create()

gistfile1.js

/* 
    Object.create();

    creates a new object with the specified prototype object and properties
    object.create(proto[, propertiesObject]);

*/
var obj = Object.create({}); // creates an empty object and is equivalent to obj = {} or obj = Object.create(Object.prototype)
var obj1 = {
    foo : 1,
    bar : function() {
        return 'Bar method called';
    }
};

var obj2 = Object.create(obj1); // now obj2 has the properties and methods of obj1 as part of its prototype not as it "own" properties
Object.keys( obj1 ) // returns ["foo", "bar"]
Object.keys( obj2 ) // returns []

/*
    Its also possible to set some initial values on the object being created, these are the object's own properties
*/

var obj3 = Object.create(obj1, {
    baz : {
        value : 'Hello World'
    }
});

Object.keys( obj3 ) // returns []

/* 
    The above line will not output what is expected as there are additional properties that are defined by default
    when settting the propertiesObject when using Object.create() which are configurable, enumerable, value, writable, get, and set
    In order to enumerate through these properties on the newly created object you would need to set enumerable to true. 
*/

obj3.baz; // returns "Hello World" and it also has access to its prototype properties and methods