problem 2_2 - mid exam

function solve(input) {

    let favoriteGenres = input.shift().split(' | ');
    let line = input.shift();

    while (line != 'Stop!') {
        let [command, genre, newGenre] = line.split(' ');

        switch (command) {
            case 'Join':
                if (favoriteGenres.includes(genre) == false) {
                    favoriteGenres.push(genre);
                }
                break;
            case 'Drop':
                if (favoriteGenres.includes(genre) == true) {
                    let index = favoriteGenres.indexOf(genre);
                    favoriteGenres.splice(index, 1);
                }
                break;
            case 'Replace':
                if (favoriteGenres.includes(genre) == true) {
                    let index = favoriteGenres.indexOf(genre);
                    favoriteGenres[index] = newGenre;
                }
                break;
            default:
                break;
        }


        line = input.shift();
    }
    console.log(favoriteGenres.join(' '));
}