Hall

function solveClasses(){
    class Hall{
        constructor( capacity, name ){
           this.capacity = capacity;
           this.name = name;
           this.events = [];
        };
        hallEvent( title ){
           if(this.events.includes(title)){
             throw new Error(`This event is already added!`)
           }else{
              this.events.push(title);
              return "Event is added.";
           }
        }
        close(){
          this.events = [];
          return `${this.name} hall is closed.`;
        }

        toString(){
            let result = [];
            result.push(`${this.name} hall - ${this.capacity}`);
            if(this.events.length !== 0){
                result.push(`Events: ${this.events.join(', ')}`);
            }
            return result.join('\n');
        }
    }

    class MovieTheater extends Hall{
        constructor( capacity, name, screenSize ){

            super(capacity,name);
            this.events = [];
            this.screenSize = screenSize;
        }
        close(){
          return `All screening are over.${super.close()}`
        }
        toString(){
           return [
               `${super.toString()}`,
               `${this.name} is a movie theater with ${this.screenSize} screensize and ${this.capacity} seats capacity.`
           ].join('\n');
        }
    }

    class ConcertHall extends Hall{
        constructor( capacity, name ){
            super(capacity,name);
           // this.events = [];
        }

        hallEvents( title, performers ) {
            this.performers = performers;
            return super.hallEvent(title);

        }

        close(){
           return `${super.close()}Аll performances are over.`;
        }

        toString(){
           let result = [];
           result.push(`${super.toString()}`);

           if(this.events.length !== 0){
               result.push(`${this.performers.join(', ')}`);
           }
           return result.join('\n');
        }
    }

    return{
        Hall,
        MovieTheater,
        ConcertHall
    }
}
 let classes = solveClasses();
// let hall = new classes.Hall(20, 'Main');
// console.log(hall.hallEvent('Breakfast Ideas'));
// console.log(hall.hallEvent('Annual Charity Ball'));
// console.log(hall.toString());
// console.log(hall.close());

// let movieHall = new classes.MovieTheater(10, 'Europe', '10m');
// console.log(movieHall.hallEvent('Top Gun: Maverick'));
// console.log(movieHall.toString());


let concert = new classes.ConcertHall(5000, 'Diamond');
console.log(concert.hallEvents('The Chromatica Ball', ['LADY GAGA']));
console.log(concert.toString());
console.log(concert.close());
console.log(concert.toString());