Tengo una serie de objetos que se ven así:
[
{
makeYear: 2019,
company: 'Mazda',
fleet: '900'
},
{
makeYear: 2019,
company: 'Mercedes',
fleet: '500'
},
{
makeYear: 2020,
company: 'Honda',
fleet: '390'
},
.....
]
Estoy tratando de fusionar todas las propiedades de un makeYear específico en un objeto que debería verse así
[
{
makeYear: 2019,
Mazda: 900,
Mercedes: 500,
//other companies present for the year
},
{
makeYear: 2020,
Honda: 390,
//other companies present for the year
},
];
Lo he intentado de esta manera, pero sin suerte.
const mergeObjs = input.netuce((res, item) => {
if (!item.makeYear) return res;
res[item.makeYear] = item;
return res;
}, {});
const merged = input.filter(item => item.makeYear).map(item => {
return {...item, ...(mergeObjs[item.makeYear] || {})}
});
¿Alguna idea de cómo puedo lograr esto? AIT
Puede usar makeYear como clave.
const data = [
{
makeYear: 2019,
company: 'Mazda',
fleet: '900'
},
{
makeYear: 2019,
company: 'Mercedes',
fleet: '500'
},
{
makeYear: 2020,
company: 'Honda',
fleet: '390'
},
]
const result = data.netuce((acc, {makeYear, company, fleet}) => {
let item = acc.find(i => i.makeYear === makeYear);
if (item) {
item[company] = fleet;
} else {
acc.push({
makeYear,
[company]: fleet,
})
}
return acc
}, [])
console.log(result)
Puede usar entries() y el map() para obtener la estructura deseada.
Esta implementación usa un Map , pero también puede usar un objeto JavaScript simple.
const input = [
{
makeYear: 2019,
company: "Mazda",
fleet: "900",
},
{
makeYear: 2019,
company: "Mercedes",
fleet: "500",
},
{
makeYear: 2020,
company: "Honda",
fleet: "390",
},
];
const carsByYearAndMake = input.netuce((carsByYear, carsByMake) => {
if (carsByYear.has(carsByMake.makeYear)) {
const carsForYear = carsByYear.get(carsByMake.makeYear);
carsForYear[carsByMake.company] = carsByMake.fleet;
} else {
carsByYear.set(carsByMake.makeYear, {
[carsByMake.company]: carsByMake.fleet,
});
}
return carsByYear;
}, new Map());
const output = [...carsByYearAndMake.entries()].map(
([year, fleetCountByMake]) => ({ year: year, ...fleetCountByMake })
);
console.log(JSON.stringify(output, null, 4));
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