javascript - 如何将对象中的索引更改为值

Question

const arr = [{
  "name": "Toyota"
}, {
  "name": "Renault"
}, {
  "name": "Jeep"
}]

const array_unique = (arr) => Array.from(new Set(arr));

const car = array_unique(
  arr.map((item) => item.name),
).sort();
console.log(car); // => ['Toyota', 'Renault', 'Jeep']

const car_map = Object.fromEntries(
  car.map((car, index) => [car, index]),
);
console.log(car_map); // => {Toyota: 0, Renault: 1, Jeep: 2,}

是否有可能将0、1、2等索引更改为汽车名称像:

{Toyota: Toyota, Renault: Renault, Jeep: Jeep,}

Answer 1

您可以使用map()和Object.fromEntries()方法

const arr = [
  { name: "Toyota" },
  { name: "Renault" },
  { name: "Jeep" },
];

const array_unique = (arr) => Array.from(new Set(arr));

const carNames = array_unique(arr.map((item) => item.name)).sort();

const carMap = Object.fromEntries(carNames.map((name) => [name, name]));

console.log(carMap);