javascript - 在 map() 的基础上使用 JS reduce()

Question

我有这个对象数组:

let authors = [
  { firstName: "Beatrix", lastName: "Potter" },
  { firstName: "Ann", lastName: "Martin" },
];

我想在使用 map() 映射数组项后统一细节，然后使用 reduce() 将对象缩减为单个字符串，这样输出将是“比阿特丽克斯·波特”、“安·马丁”。

我尝试了以下代码但失败了:

fullAuthorNames = authors.map( (e)=> 
    authors.reduce( (firstName, lastName)=> firstName + lastName );
);

这是相关的输出:

["[object Object][object Object][object Object][object Object][object Object]","[object Object][object Object][object Object][object Object][object Object]"

我这里做错了什么？也许我没有针对数组中的对象？

Answer 1

你不需要reduce，只需要map然后join结果数组:

let fullAuthorNames = authors.map(a => a.firstName + " " + a.lastName).join(", ");

示例:

let authors = [
  { firstName: "Beatrix", lastName: "Potter" },
  { firstName: "Ann", lastName: "Martin" },
];


let fullAuthorNames = authors.map(a => a.firstName + " " + a.lastName).join(", ");

console.log(fullAuthorNames);