for-of.js

// for..of loops
// for..of versus for..in loops

let supernatural = { 
    "actors":['Jared Padelecki', 'Jensen Ackles', 'Mark Sheppard', 'Misha Collins'],
    "characters":['Sam Winchester', 'Dean Winchester', 'Crowley', 'Castiel'],
    "seasons":12 };

for( prop in supernatural){
    console.log( prop, typeof supernatural[prop],
               Array.isArray(supernatural[prop]) );
}

for( prop in supernatural.actors){
    console.log(prop, supernatural.actors[prop]);
}

for( name of supernatural.actors){
    console.log( name );
}