const cars = {1: ['car a', 'car b'], 3: ['car c']};
const Car = {
count: (user) => new Promise((resolve, reject) =>
setTimeout(() => resolve(cars[user.userId]), 1000))
};
function findCars(users) {
return Promise.all(users.map((user) =>
Car.count({
userId: user._id
})
.then((car) => {
user.hasCar = !!car;
return user;
})
))
.then(console.log);
}
const users = [{_id: 1}, {_id: 2}, {_id: 3}];
findCars(users);
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