Practice Sessions

function solve(input){
let race = {};

  input.forEach(line => {
     let [command, road, racer, nextRoad] = line.split('->');
      // console.log(command);
     switch(command){
        case "Add":
          if(!race.hasOwnProperty(road)){
          race[road] = [];
          race[road].push(racer);
          } else if(!race[road].includes(racer)){
            race[road].push(racer);
          }
        // console.log(race);
          break;
        case "Move":
          if(race.hasOwnProperty(road)){
            let index = race[road].indexOf(racer);
            race[road].splice(index, 1);
            race[nextRoad].push(racer);
          }
          // console.log(race);
          break;
        case "Close":
            delete race[road];
          // console.log(race);
          break;
        case "END":
          break;
     }
  });
    let sorted = Object.entries(race).sort((a,b) => b[1].length - a[1].length || a[0].localeCompare(b[0]));
console.log("Practice sessions:");
  for(let kvp of sorted){
    console.log(`${kvp[0]}`);
    for(let kkk of kvp[1]){
      console.log(`++${kkk}`);
    }
  }
}