如何访问和循环嵌套在另一个对象内部的对象中的数组？

debugcn 发表于 Dev

密理根

我对刚开始学习JS的编程非常陌生。我有一个练习，不确定如何解决。任务是计算哪个用户拥有最多的技能。给定的代码如下：

const users = {
  Alex: {
    email: '[email protected]',
    skills: ['HTML', 'CSS', 'JavaScript'],
    age: 20,
    isLoggedIn: false,
    points: 30
  },
  Asab: {
    email: '[email protected]',
    skills: ['HTML', 'CSS', 'JavaScript', 'Redux', 'MongoDB', 'Express', 'React', 'Node'],
    age: 25,
    isLoggedIn: false,
    points: 50
  },
  Brook: {
    email: '[email protected]',
    skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux'],
    age: 30,
    isLoggedIn: true,
    points: 50
  },
  Daniel: {
    email: '[email protected]',
    skills: ['HTML', 'CSS', 'JavaScript', 'Python'],
    age: 20,
    isLoggedIn: false,
    points: 40
  },
  John: {
    email: '[email protected]',
    skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux', 'Node.js'],
    age: 20,
    isLoggedIn: true,
    points: 50
  },
  Thomas: {
    email: '[email protected]',
    skills: ['HTML', 'CSS', 'JavaScript', 'React'],
    age: 20,
    isLoggedIn: false,
    points: 40
  },
  Paul: {
    email: '[email protected]',
    skills: ['HTML', 'CSS', 'JavaScript', 'MongoDB', 'Express', 'React', 'Node'],
    age: 20,
    isLoggedIn: false,
    points: 40
  }
}

我想我需要使用一个循环，但是，不确定我如何访问技能数组？

亭子

确实，您可以在users对象的键上使用循环。然后比较skills属性的长度，以找到哪个用户拥有最长的列表：

const users = {Alex: {email: '[email protected]',skills: ['HTML', 'CSS', 'JavaScript'],age: 20,isLoggedIn: false,points: 30},Asab: {email: '[email protected]',skills: ['HTML', 'CSS', 'JavaScript', 'Redux', 'MongoDB', 'Express', 'React', 'Node'],age: 25,isLoggedIn: false,points: 50},Brook: {email: '[email protected]',skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux'],age: 30,isLoggedIn: true,points: 50},Daniel: {email: '[email protected]',skills: ['HTML', 'CSS', 'JavaScript', 'Python'],age: 20,isLoggedIn: false,points: 40},John: {email: '[email protected]',skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux', 'Node.js'],age: 20,isLoggedIn: true,points: 50},Thomas: {email: '[email protected]',skills: ['HTML', 'CSS', 'JavaScript', 'React'],age: 20,isLoggedIn: false,points: 40},Paul: {email: '[email protected]',skills: ['HTML', 'CSS', 'JavaScript', 'MongoDB', 'Express', 'React', 'Node'],age: 20,isLoggedIn: false,points: 40}}

let topUser;
for (let user in users) {
    if (!topUser || users[user].skills.length > users[topUser].skills.length) topUser = user;
}

console.log(topUser);

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