var str = 'abcdef';
alert('\u202E'+str);

let arr = [
    {car: 'audi' , color: 'red'},
    {car: 'audi' , color: 'black'},
    {car: 'bmv' , color: 'black'},
    {car: 'bmv' , color: 'red'},
    {car: 'mers' , color: 'black'},
]
const unique = (array) => [...new Set(array.map(item => item.car))];

console.log(unique(arr))