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user538760
Asked:2023-01-30 16:44:12 +0000 UTC2023-01-30 16:44:12 +0000 UTC

如何使用过滤器映射排序按条件从对象数组中获取已排序的名称数组

  • 772

完成代码，使 names 变量包含按字母顺序排列的作者姓名数组，这些作者的图书评级大于MIN_BOOK_RATING变量的值。

const books = [
  {
    title: "The Last Kingdom",
    author: "Bernard Cornwell",
    rating: 8.38,
  },
  {
    title: "Beside Still Waters",
    author: "Robert Sheckley",
    rating: 8.51,
  },
  {
    title: "The Dream of a Ridiculous Man",
    author: "Fyodor Dostoevsky",
    rating: 7.75,
  },
  { title: "Redder Than Blood", author: "Tanith Lee", rating: 7.94 },
  {
    title: "The Dreams in the Witch House",
    author: "Howard Lovecraft",
    rating: 8.67,
  },
];
const MIN_BOOK_RATING = 8;
// Change code below this line

const names = books
  .filter((rating, index, array) => array.indexOf(rating) > MIN_BOOK_RATING)
  .map(rating => rating.author)
  .sort((a, b) => a.localeCompare(b));
  
console.log(names)

求助，我想不通。

javascript

2 个回答

  1. Best Answer

    您的过滤方法有误。需要过滤数组中每个可迭代对象的数据，将当前评分值与MIN_BOOK_RATING进行比较

    const books = [
  {
    title: "The Last Kingdom",
    author: "Bernard Cornwell",
    rating: 8.38,
  },
  {
    title: "Beside Still Waters",
    author: "Robert Sheckley",
    rating: 8.51,
  },
  {
    title: "The Dream of a Ridiculous Man",
    author: "Fyodor Dostoevsky",
    rating: 7.75,
  },
  { title: "Redder Than Blood", author: "Tanith Lee", rating: 7.94 },
  {
    title: "The Dreams in the Witch House",
    author: "Howard Lovecraft",
    rating: 8.67,
  },
];
const MIN_BOOK_RATING = 8;
// Change code below this line

const names = books
  .filter(rating => rating.rating > MIN_BOOK_RATING)
  .map(rating => rating.author)
  .sort((a, b) => a.localeCompare(b));

console.log(names);

    • 1

  2. 你做的几乎是对的，只是在过滤书籍时犯了一点错误。并且对于这样的排序，不需要传递排序器，默认情况下数组就是这样排序的。

    const books = [{
    title: "The Last Kingdom",
    author: "Bernard Cornwell",
    rating: 8.38,
  },
  {
    title: "Beside Still Waters",
    author: "Robert Sheckley",
    rating: 8.51,
  },
  {
    title: "The Dream of a Ridiculous Man",
    author: "Fyodor Dostoevsky",
    rating: 7.75,
  },
  {
    title: "Redder Than Blood",
    author: "Tanith Lee",
    rating: 7.94
  },
  {
    title: "The Dreams in the Witch House",
    author: "Howard Lovecraft",
    rating: 8.67,
  },
];
const MIN_BOOK_RATING = 8;
// Change code below this line

const names = books
  .filter((book) => book.rating > MIN_BOOK_RATING)
  .map(rating => rating.author)
  .sort();

console.log(names)

    • 0

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