如何在对象内打印Javascript数据数组

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)