JavaScript [JavaScript/Node.js] use class to define enum types

[xkkui]

Hi! Every body, I found a lot of articles, how to define enum in JavaScript/Node.js.
Most of the answer that is usage closure function.
But I found the article that is usage class.
The following code:

"use strict";

class GenderTypeEnum {
    static SECRECY = new GenderTypeEnum(0, "保密");
    static MALE = new GenderTypeEnum(1, "男");
    static FEMALE = new GenderTypeEnum(2, "女");

    constructor (code, name) {
        this.code = code;
        this.name = name;
    }
}

module.exports = GenderTypeEnum;

I try using the code. But I discover that static field or field of instance can be changed on outside of module.
e.g.:

const GenderTypeEnum = require("./GenderTypeEnum");
console.log(GenderTypeEnum.MALE.code); /// 1

GenderTypeEnum.MALE.code = 4;
console.log(GenderTypeEnum.MALE.code); /// 4

console.log(GenderTypeEnum.FEMALE); /// GenderTypeEnum { code: 2, name: '女' }

GenderTypeEnum.FEMALE = "female";
console.log(GenderTypeEnum.FEMALE); /// female

Refer: https://www.sohamkamani.com/javascript/enums/

 

[xkkui]

Hi! Every body, I found a lot of articles, how to define enum in JavaScript/Node.js.
Most of the answer that is usage closure function.
But I found the article that is usage class.
The following code:

"use strict";

class GenderTypeEnum {
    static SECRECY = new GenderTypeEnum(0, "保密");
    static MALE = new GenderTypeEnum(1, "男");
    static FEMALE = new GenderTypeEnum(2, "女");

    constructor (code, name) {
        this.code = code;
        this.name = name;
    }
}

module.exports = GenderTypeEnum;

I try using the code. But I discover that static field or field of instance can be changed on outside of module.
e.g.:

const GenderTypeEnum = require("./GenderTypeEnum");
console.log(GenderTypeEnum.MALE.code); /// 1

GenderTypeEnum.MALE.code = 4;
console.log(GenderTypeEnum.MALE.code); /// 4

console.log(GenderTypeEnum.FEMALE); /// GenderTypeEnum { code: 2, name: '女' }

GenderTypeEnum.FEMALE = "female";
console.log(GenderTypeEnum.FEMALE); /// female

And then i modified, the following:

"use strict";

class GenderTypeEnum {
    static SECRECY = new GenderTypeEnum(0, "保密");
    static MALE = new GenderTypeEnum(1, "男");
    static FEMALE = new GenderTypeEnum(2, "女");

    constructor (code, name) {
        this.code = code;
        this.name = name;

        Object.freeze(this); /// freeze object, fields of code and name is forbade changing
    }
}

/// freeze class, static field of GenderTypeEnum class is forbade changing
module.exports = Object.freeze(GenderTypeEnum);

Regardless of compatibility, Bewteen closure function and the above code which is better.

Please forgive me for my poor English.
Refer: https://www.sohamkamani.com/javascript/enums/