javascript - 循环遍历具有嵌套数组的对象数组

Question

给出这个简单的例子:

const testdata = [
  {
    id: "001",
    name: "Bob",
    comments: [
      {
        id: "01",
        text: "Hello World"
      },
      {
        id: "02",
        text: "Hello Mars"
      }
    ]
  }
];

我想输出该对象的所有评论:

这样我就得到了 id 和名字

testdata.map(i => { console.log(i.id + i.name)});

输出保存注释的嵌套数组的最佳方式是什么？

Answer 1

使用Array.map()获取comments数组的数组，然后按 spreading 展平进入Array.concat() :

const testdata = [{"id":"001","name":"Bob","comments":[{"id":"01","text":"Hello World"},{"id":"02","text":"Hello Mars"}]},{"id":"002","name":"Sara","comments":[{"id":"03","text":"Hello Jupiter"},{"id":"04","text":"Hello Moon"}]}];

const comments = [].concat(...testdata.map((d) => d.comments));

console.log(comments);