Object properties can even be assigned other objects or variables too. The example below shows an object with keys that have been assigned a variable, an array, and an object.
var kittenName = "Feathers";
var kitten = {
name: kittenName,
toyCollection: ['blue ball', 'green ball', 'hoover box'],
favoriteLocation: {
roomName: 'Living room',
napPlace: 'window',
idealTemperatureCelsius: 24
}
};