如何在不影响其他构造函数的情况下更改构造函数的一个属性？

Question

如何在方法"refactorGroupInfo“中更改构造函数的一个属性，以便其他属性不会”未定义“。或如何使此方法具有通用性，以便您可以更改构造函数的一个属性或所有属性。

​

class Group {
    constructor(nameGroup,course,specialization) {
            this.nameGroup = nameGroup;
            this.course = course;
            this.specialization = specialization;
    }
    refactorGroupInfo(nameGroup, course,specialization) {
        this.nameGroup = nameGroup;
        this.course = course;
        this.specialization = specialization;
    }
}
let Dev = new Group("D-11",4,"Front-end");
Devs.refactorGroupInfo("D-12");
console.log(Devs);

​

Answer 1

我更喜欢使用一个对象，这样你在里面定义的每个键都会被修改。

​

class Group {
  constructor(nameGroup, course, specialization) {
    this.nameGroup = nameGroup;
    this.course = course;
    this.specialization = specialization;
  }

  refactorGroupInfo(object) {
    Object.keys(object).forEach((x) => {
      this[x] = object[x];
    });
  }
}

const dev = new Group('D-11', 4, 'Front-end');

dev.refactorGroupInfo({
  nameGroup: 'D-12',
});

console.log(dev);

​

Answer 2

在您的refactorGroupInfo函数中，您可以添加一个检查，以查看该函数的参数是否尚未定义。

refactorGroupInfo(nameGroup, course,specialization) {
    this.nameGroup = typeof nameGroup !== 'undefined' ? nameGroup : this.nameGroup;
    this.course = typeof course !== 'undefined' ? course : this.course;
    this.specialization = typeof specialization !== 'undefined' ? specialization : this.specialization;
}