The Pianist

function thePianist(input){
    let piecesCount = Number(input.shift());
    let infoObj = {};
    for(let index = 0; index <piecesCount; index++){
      let [name, composer, key] = input[index].split('|');
      infoObj[name] = {
        composer,
        key,
      }
    }
    let index = piecesCount;
    while(input[index] !== 'Stop') {
      let [action, ...data] = input[index].split('|');
      switch(action) {
        case 'Add':
          let [nameToAdd, composer, key] = data;
          if(infoObj.hasOwnProperty(nameToAdd)) {
            console.log(`${nameToAdd} is already in the collection!`)
          } else {
            infoObj[nameToAdd] = {
              composer,
              key,
            }
            console.log(`${nameToAdd} by ${composer} in ${key} added to the collection!`);
          }
          break;
        case 'Remove':
          let pieceToRemove = data[0];
          if(infoObj.hasOwnProperty(pieceToRemove)) {
            delete infoObj[pieceToRemove];
            console.log(`Successfully removed ${pieceToRemove}!`);
          } else {
            console.log(`Invalid operation! ${pieceToRemove} does not exist in the collection.`);
          }
          break;
        case 'ChangeKey':
          let [pieceToUpdate, newKey] = data;
          if(infoObj.hasOwnProperty(pieceToUpdate)) {
            infoObj[pieceToUpdate].key = newKey;
            console.log(`Changed the key of ${pieceToUpdate} to ${newKey}!`);
          } else {
            console.log(`Invalid operation! ${pieceToUpdate} does not exist in the collection.`);
          }
          break;
      }
      index++;
    }
    for(const piece in infoObj) {
      console.log(`${piece} -> Composer: ${infoObj[piece].composer}, Key: ${infoObj[piece].key}`);
    }
}