javascript - 从对象数组中获取特定数据并转换为对象

Question

我有一个对象数组。每个对象中还有另一个数组。

结构:

function getData() {
  return [
    {
      _id: 1,
      tags: ["tomato", "butter", "milk"],
      title: "How to make soup?",
      category: "Food"
    },
    {
      _id: 2,
      tags: ["pepper", "salt", "basil"],
       title: "How to use herbs?",
      category: "Herbs"
    },
  ];
}

我试图从数组中获取:标签和类别。输出应该是:

{
      tags: ["tomato", "butter", "milk"],
      category: "Food"
},
 {
      tags: ["pepper", "salt", "basil"],
      category: "Herbs"
},

我尝试了一些概念，但结果并不如我所愿:(

例如:

function getTagsandCategory() {
  const tags = getData()
    .map(post => {post.tags, post.category});

 console.log(tags);
}

getTagsandCategory(); 
// Output: [undefined, undefined]

或更好(但不幸的是不理想)

 function getTagsandCategory() {
  const tags = getData()
    .map(post => [post.tags, post.category]);

 console.log(tags);
}

getTagsandCategory();
// Output: [["tomato", "butter", "milk"], "Food"]

请问您有什么想法，如何实现？谢谢!

Answer 1

你需要使用Array.prototype.map()

const data = [
    {
      _id: 1,
      tags: ["tomato", "butter", "milk"],
      title: "How to make soup?",
      category: "Food"
    },
    {
      _id: 2,
      tags: ["pepper", "salt", "basil"],
       title: "How to use herbs?",
      category: "Herbs"
    },
  ];
  
  const output = data.map(obj => ({ tags: obj.tags, category: obj.category }));
  
  console.log(output);