JavaScript：将对象数组映射到字典

JavaScript：将对象数组映射到字典

#javascript#打字稿#数据

在 JavaScript / TypeScript 中将对象数组转换为字典的最简单方法：

let data = [
  {id: 1, country: 'Germany', population: 83623528},
  {id: 2, country: 'Austria', population: 8975552},
  {id: 3, country: 'Switzerland', population: 8616571}
];

let dictionary = Object.assign({}, ...data.map((x) => ({[x.id]: x.country})));
// {1: "Germany", 2: "Austria", 3:

 

另外一种办法：

Object.fromEntries很好，像这样使用怎么样：

let dictionary = Object.fromEntries(data.map(x => [x.id, x.country]));