// define global state change callback
PropState.prototype.onChange = function (state, key, value) {
    console.log('Object State updated ', state);
};

// initialize all states
var propState = new PropState(
    {name: 'a', value: 1, onChange: function (key, value) { console.log(key+' updated', value); }},
    {name: 'b', value: 2, onChange: function (key, value) { console.log(key+' updated', value); }},
    {name: 'c', value: 3}
);

console.log(propState.a);

propState.a = 3; // change state to invoke its callback

console.log(propState.a);

// get all states
for (var stateName in propState) {
    console.log(propState[stateName]);
}