Incorporate fresh data into an array organized by groups using Javascript

Question

Incorporate fresh data into an array organized by groups using Javascript

I am looking to update my grouped array with new records. For example:

var cars = [{ make: 'audi', model: 'r8', year: '2012' }, { make: 'audi', model: 'rs5', year: '2013' }, { make: 'ford', model: 'mustang', year: '2012' }, { make: 'ford', model: 'fusion', year: '2015' }, { make: 'kia', model: 'optima', year: '2012' }];

var result = cars.reduce(function (r, a) {
    r[a.make] = r[a.make] || [];
    r[a.make].push(a);
    return r;
}, Object.create(null));

console.log(result);

I would greatly appreciate any assistance with this.

javascript arrays

Answer 1

Answer №1

Here is a potential solution:

const cars = {"audi":[{"make":"audi","model":"r8","year":"2012"},{"make":"audi","model":"rs5","year":"2013"}],"ford":[{"make":"ford","model":"mustang","year":"2012"},{"make":"ford","model":"fusion","year":"2015"}],"kia":[{"make":"kia","model":"optima","year":"2012"}]};

const addCar = (cars, newCar) =>
    Object.keys(cars).some((key) => key === newCar.make)//check if car already exists
        ? { ...cars, [newCar.make]: cars[newCar.make].concat(newCar) }//car exists
        : { ...cars, [newCar.make]: [newCar] };//car does not exist

console.log(addCar(cars, { make: 'kia', model: 'hello world' }).kia);

Answer 2

Here is a potential solution:

const cars = {"audi":[{"make":"audi","model":"r8","year":"2012"},{"make":"audi","model":"rs5","year":"2013"}],"ford":[{"make":"ford","model":"mustang","year":"2012"},{"make":"ford","model":"fusion","year":"2015"}],"kia":[{"make":"kia","model":"optima","year":"2012"}]};

const addCar = (cars, newCar) =>
    Object.keys(cars).some((key) => key === newCar.make)//check if car already exists
        ? { ...cars, [newCar.make]: cars[newCar.make].concat(newCar) }//car exists
        : { ...cars, [newCar.make]: [newCar] };//car does not exist

console.log(addCar(cars, { make: 'kia', model: 'hello world' }).kia);

Incorporate fresh data into an array organized by groups using Javascript

Answer №1

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