function createAssemblyLine() {
    return {
        hasClima(car) {
            car.temp = 21;
            car.tempSettings = 21;
            car.adjustTemp = () => {
                if (car.temp < car.tempSettings) {
                    car.temp++;
                } else if (car.temp > car.tempSettings){
                    car.temp--;
                }
            }
        },

        hasAudio(car) {
            car.currentTrack = {
                'name': '',
                'artist': '',
            };
            car.nowPlaying = () => {
                if (car.currentTrack !== null) {
                    console.log(`Now playing '${car.currentTrack.name}' by ${car.currentTrack.artist}`);
                }
            }
        },   

        hasParktronic(car) {
            car.checkDistance = (distance) => {
                if (distance < 0.1) {
                console.log('Beep! Beep! Beep!');
                } else if (distance < 0.25) {
                console.log('Beep! Beep!');
                } else if (distance < 0.5) {
                console.log('Beep!');
                } else {
                console.log('');
                }
            }
        }
    }
}