gistfile1.js

class Song {
  constructor(title, artist, duration, isPlaying = false) {
    this.title = title;
    this.artist = artist;
    this.duration = duration;
    this.isPlaying = isPlaying; 
  }
  
  start() {
    this.isPlaying = true;
  }
  
  stop() {
    this.isPlaying = false;
  }
}