javascript - 如何在 JavaScript 中创建一个包含其他类集合的类

Question

我想创建一个名为 SchoolCatalog 的类，它将保存学校的集合，例如为小学、初中和高中创建一个 SchoolCatalog 实例。 (这是 Code Academy Introduction To JavaScript 中的问题之一)。但是，他们没有关于如何制作目录以容纳论坛中所有类(class)的适当指南。所以，如果有人能帮助我，我将不胜感激。

class School {
  constructor(name, level, numberOfStudents) {
    this._name = name
    this._level = level
    this._numberOfStudents = numberOfStudents 
  }
  
  get name() {
    return this._name
  }
  
  get level() {
    return this._level
  }
  
  get numberOfStudents() {
    return this._numberOfStudents 
  }
  
  
  set numberOfStudents(studentsNumber) {
    if (typeof studentNumber === 'number')
      this._numberOfStudents = studentsNumber
    else
      console.log(`Invalid input: numberOfStudents must be set to a Number.`)
  }
  
  quickFacts() {
    console.log(`${this._name} educates ${this._numberOfStudents} students at the ${this._level} school level.`)
  }
  
  static pickSubstituteTeacher(substituteTeachers) {
    const randomTeacher = Math.floor(Math.random() * substituteTeachers.length)
    console.log(substituteTeachers[randomTeacher])
  }
  
}

// Primary School

class PrimarySchool extends School {
  constructor(name, numberOfStudents, pickupPolicy) {
    super(name, 'primary', numberOfStudents)
    this._pickupPolicy = pickupPolicy
  }
  
  get pickupPolicy() {
    return this._pickupPolicy
  }
}


class HighSchool extends School {
  constructor(name, numberOfStudents, sportsTeams) {
    super(name,'high', numberOfStudents)
    this._sportsTeams = sportsTeams
  }
  
  get sportsTeams() {
    this._sportsTeams.forEach(team => {
      console.log(team)
    })
  }
}

const lorraineHansbury = new PrimarySchool('Lorraine Hansbury', 514, 'Students must be picked up by a parent, guardian, or a family member over the age of 13.')

lorraineHansbury.quickFacts()
PrimarySchool.pickSubstituteTeacher(['Jamal Crawford', 'Lou Williams', 'J. R. Smith', 'James Harden', 'Jason Terry', 'Manu Ginobli'])


const alSmith = new HighSchool('Al E. Smith', 415, ['Baseball', 'Basketball', 'Volleyball', 'Track and Field'])
alSmith.sportsTeams


// My Attempt To Make Collection of Classes


/*class SchoolCatalog {
  constructor(schools) {
    this._schools = schools
  }
  
  get schools() {
    this._schools.forEach(school => {
      console.log(school)
    })
  }
}


const catalog = new SchoolCatalog([''])*/

Answer 1

您的实现有问题吗？

class Catalog{
   constructor(){
     this.schools = []
   }
   addSchool(school){
     if(!this[school._name]){
       // reference for easy access
       this[school._name]=school;
     }
     this.schools.push(school);
   }
}

如果我需要一个列表，我可以遍历并仍然可以轻松地从中获得单一学校，这就是我的做法，

也就是说，根据您的要求，这可能是完全错误的。

你的实现乍一看并没有错， 它给你一个错误吗？