javascript - 如何组合对象并将其传输到类 w/es6 的数组

Question

有必要编写一个类，其中包含针对学生的方法。让它成为任务 1。接下来，我需要编写另一个类，该类将在数组中包含来自任务 1 的对象。据我所知，像 [{name: '' ...}, {name: ''}] 应该出来但是怎么写才正确呢，我就是看不懂或者我很笨

是否可以立即创建包含对象的数组，还是通过方法完成？

class Student {
  constructor(fName, lName, birth, marks) {
    this.fName = fName;
    this.lName = lName;
    this.birth = birth;
    this.marks = marks;
    this.attendance = [];

  }
  midAttendance() {
    var count = 0;
    var sum = 0;
    for (var i = 0; i < this.attendance.length; i++) {
      if (this.attendance[i] === 'true') {
        count++;
        sum++;
      } else {
        sum++;
      }
    }
    return count / sum;
  }

  getAge() {
    return new Date().getFullYear() - this.birth;
  }
  midMark() {
    var count = 0;
    var sum = 0;
    for (var i = 0; i < this.marks.length; i++) {
      count++;
      sum += this.marks[i];
    }
    return (sum / count);
  }
  present() {
    if (this.attendance.length < 25) {
      this.attendance.push('true');
    } else {
      alert("full")
    };
  }
  absent() {
    if (this.attendance.length < 25) {
      this.attendance.push('false');
    } else {
      alert("full")
    };
  }
  summary() {
    var mMark = this.midMark();
    var mAttendance = this.midAttendance();
    if (mMark > 90 && mAttendance > 0.9) {
      return "molodec";
    } else if ((mMark > 90 && mAttendance <= 0.9) || (mMark <= 90 && mAttendance > 0.9)) {
      return "norm";
    } else {
      return "rediska";
    }
  }
}

class Students extends Student {
  constructor() {
    super(fName, lName, birth, marks);
  }
  let arr = [];
  getStudents() {

  }
}

let student1 = new Student('alex', 'petrov', '1999', [90, 94, 91, 91, 90]);
let student2 = new Student('vova', 'ivanov', '1994', [2, 3, 4, 3, 5]);

Answer 1

Students 不应扩展 Student。 extends 用于定义一个子类，代表一个IS-A关系。但是学生列表不是一种学生。

Students应该是一个完全独立的类，例如

class Students {
    constructor() {
        this.arr = [];
    }
    addStudent(s) {
        this.arr.push(s);
    }
    removeStudent(s) {
        let index = this.arr.indexOf(s);
        if (index > -1) {
            this.arr.splice(index, 1);
        }
    }
    getStudents() {
        return this.arr.slice(); // make a copy so they can't modify the actual array
    }
}

然后你可以这样做:

let class = new Students;
class.addStudent(student1);
class.addStudent(student2);
console.log(class.getStudents());