我對如何在下面的代碼中實現不同數據類型的轉換感到困惑。轉換包括（int 到 string、string 到 int、float 到 int 等）我的老師說當我讀/寫文件時這可以很容易地完成，但我仍然很困惑。我將不勝感激任何幫助或建議，謝謝！這是我的代碼：//filesvar fs = require("fs");//reading filesfs.readFile('sources.txt', (err, data) => {  console.log("File output: " + data.toString());  //writing files      fs.writeFile('written.txt',data,(err, result) => {        if(err) console.log('error', err);      });}); // planet classclass Planet{    constructor(name, numberOfMoons, size) {        this.name = name;        this.numberOfMoons = numberOfMoons;        this.size = size;    }    orbit(){        //return value        return `${this.name} is a planet and therefore orbits around the sun.`    }}//inheritance classclass DwarfPlanet extends Planet{    constructor(name, numberOfMoons, size, orbitalNeighbourhood) {        super(name, numberOfMoons, size);        this.orbital = orbitalNeighbourhood;    }    getOrbital(){        //return value        return `${this.name} is a dwarf planet because it doesn't have a clear orbital neighnourhood "`    }}let earth = new Planet('Earth', 1 , 6371);console.log(earth.orbit());let pluto = new DwarfPlanet("Pluto", 5 , 1188, 'Kuiper Belt');console.log(pluto.getOrbital());//Array of Objects (anonymous option)var stars = [    {        name: 'Sun',        temperature: 5778,        colour: 'White'    },    {        name: 'Pistol',        temperature: 11800,        colour: 'Blue'    },    {        name: "Antares",        temperature: 3500,        colour: "Red"    }];// Array of Objects (using Planet Class)var planets = [  new Planet('Earth', 'One moon', '6,371 km'),  new Planet('Mars', 'Two mooons', '3,389 km'),  new Planet('Uranus', 'Twenty-seven moons', '25,362 km'),  new Planet('Saturn', 'Fifty-three moons', '58,232 km'),];console.log("Fun Fact: the biggest star isn't the sun, instead it is a blue star called 'Pistol'. Here's some information about it: ");console.log(stars[1]);console.log('Here are some planets and their properties:');console.log(planets);