Challenge: Solution Review

class RockMusicVisitor{
    visit(musicLibrary) {
        var rockPlayList=[]; 
        var index = 0;
        var songlist = musicLibrary.songsList.length 
        for(var i=0; i<songlist; i++){
            var song = musicLibrary.songsList[i]
            if(song.getGenre() == "Rock"){
                rockPlayList[index] = song.getName()
                index++
            }
        }
        return rockPlayList
    }
}
class Song{
    constructor(name,genre){
        this.name = name
        this.genre = genre
    }
    getName(){
        return this.name
    }
    getGenre(){
        return this.genre
    }
}
class MusicLibrary{
    constructor(){
        this.songsList = []
    }
    addSong(song){
        this.songsList.push(song)
    }
    accept(visitor){
        return visitor.visit(this)
    }
}
//creating a rock music visitor
var rockmusicVisitor = new RockMusicVisitor()
//creating songs of different genres 
var song1 = new Song("Bohemian Rhapsody","Rock")
var song2 = new Song("Stairway to Heaven","Rock")
var song3 = new Song("Oops I did it again", "Pop")
var song4 = new Song("Crazy", "Country")
//creating a music library
var musicLibrary = new MusicLibrary()
//adding songs to the music library
musicLibrary.addSong(song1)
musicLibrary.addSong(song2)
musicLibrary.addSong(song3)
musicLibrary.addSong(song4)
//using the rockmusicVisitor to create a separate rock music play list
console.log("The music library has the following rock music: " + musicLibrary.accept(rockmusicVisitor))