Object.getOwnPropertyDescriptor()

gistfile1.js

var obj8 = {};

Object.defineProperties(obj8, {
    foo : {
        value : 100,
        configurable : false,
        enumerable : true
    },
    bar : {
        value : 300,
        writable : true
    }
});

Object.getOwnPropertyDescriptor(obj8, 'foo'); // returns {value: 100, writable: false, enumerable: true, configurable: false}
Object.getOwnPropertyDescriptor(obj8, 'bar'); // returns {value: 1000, writable: true, enumerable: false, configurable: false}

var obj9 = Object.create({});
obj.x = true;

Object.getOwnPropertyDescriptor(obj9, 'x'); // returns {value: true, writable: true, enumerable: true, configurable: true}