How to print Javascript data Array inside object

Question

I have details of the students; how to get my expected output? In one object I want the name of the student as key and an array of their car names as value

let empArray = [{
 "name": "soma",
 "cars Details": [{
 "name": "audi",
 "cost": 120000,
 "Speed": "150Km/hr"
 }, {
 "name": "toyota",
 "cost": 120000,
 "Speed": "150Km/hr"
 }],
 "salary": 40000
 },
 {
 "name": "steven",
 "cars Details": [{
 "name": "bmw",
 "cost": 120000,
 "Speed": "150Km/hr"
 }],
 "salary": 70000
 },
 {
 "name": "booth",
 "cars Details": [{
 "name": "swift",
 "cost": 120000,
 "Speed": "150Km/hr"
 }, {
 "name": "audi",
 "cost": 120000,
 "Speed": "150Km/hr"
 }],
 "salary": 35000
 },
]
let a = {}
var ids = [];
for (let i = 0; i < empArray.length; i++) {
 a = empArray[i]["cars Details"]
 console.log(a)
}

Expected Output

{soma :["audi","toyota"],steven:["bmw"],booth:["swift","audi"]}

Answer 1

let empArray = [{ "name": "soma", "cars Details": [{ "name": "audi", "cost": 120000, "Speed": "150Km/hr" }, { "name": "toyota", "cost": 120000, "Speed": "150Km/hr" }], "salary": 40000 }, { "name": "steven", "cars Details": [{ "name": "bmw", "cost": 120000, "Speed": "150Km/hr" }], "salary": 70000 }, { "name": "booth", "cars Details": [{ "name": "swift", "cost": 120000, "Speed": "150Km/hr" }, { "name": "audi", "cost": 120000, "Speed": "150Km/hr" }], "salary": 35000 },]
let dict = {}
empArray.forEach((e) => {
 dict[e.name] = e["cars Details"].map((car) => {
 return car.name
 })
})
console.log(dict)

Answer 2

You can use Array.prototype.reduce() and Array.prototype.map() to do:

// input
let empArray = [{
 "name": "soma",
 "cars Details": [{
 "name": "audi",
 "cost": 120000,
 "Speed": "150Km/hr"
 }, {
 "name": "toyota",
 "cost": 120000,
 "Speed": "150Km/hr"
 }],
 "salary": 40000
 },
 {
 "name": "steven",
 "cars Details": [{
 "name": "bmw",
 "cost": 120000,
 "Speed": "150Km/hr"
 }],
 "salary": 70000
 },
 {
 "name": "booth",
 "cars Details": [{
 "name": "swift",
 "cost": 120000,
 "Speed": "150Km/hr"
 }, {
 "name": "audi",
 "cost": 120000,
 "Speed": "150Km/hr"
 }],
 "salary": 35000
 },
];
const output = empArray.reduce((outObj, item) => {
 outObj[item.name] = item['cars Details'].map(detail => detail.name);
 return outObj
}, {});
// test
console.log(output)

By the way, if you can, I'd recommend avoiding object keys containing spaces and change cars Details to carsDetails

Answer 3

let empArray=[{name:"soma","cars Details":[{name:"audi",cost:12e4,Speed:"150Km/hr"},{name:"toyota",cost:12e4,Speed:"150Km/hr"}],salary:4e4},{name:"steven","cars Details":[{name:"bmw",cost:12e4,Speed:"150Km/hr"}],salary:7e4},{name:"booth","cars Details":[{name:"swift",cost:12e4,Speed:"150Km/hr"},{name:"audi",cost:12e4,Speed:"150Km/hr"}],salary:35e3}];
let result = empArray.reduce((acc,e) => ({[e.name]:e['cars Details'].map(n => n.name),...acc}), {} )
console.log(result)