JavaScript Properties2.js

var cat = { name: 'Felix', color:'blue' }

// We can view the properties in the object by simply looping through:
for(var property in cat) {
    document.write(key + ": " + cat[property] + ";"); // name: Felix; color:blue;
}

// Now we set enumerable to false
Object.defineProperty(cat, ‘name’, {ennumerable: false})

// name does not get ennumerated
for(var property in cat) {
    document.write(key + ": " + cat[property] + ";"); // color:blue;
}

// We can use the keys object to access an array of the keys
//  Returns ['name', 'color']
Object.keys(cat)