const mobiles = [
    {
        brand: 'Samsung',
        model: 'Galaxy Note 9'
    },
    {
        brand: 'Google',
        model: 'Pixel 3'
    },
    {
        brand: 'Apple',
        model: 'iPhone X'
    }
];

mobiles.forEach(mobile => {
    for (let key in mobile) {
        console.log(`${key}: ${mobile[key]}`);
    }
});