Task Planner

function solve(param){
   let tasks = param.shift().split(' ').map(Number);
   for(let element of param){
     let [command,item,time] = element.split(' ');

     if(command === 'End'){
       break;
     }

     switch(command){
       case 'Complete':
         let index = +item;
         if(index >= 0 && index < tasks.length){
           if(tasks.includes(index)){
              tasks.splice(index,1,0);
           }
         }
       ;break;
       case 'Change':
         let ind = +item;
         let timeTask = +time;
         if(ind >= 0 && ind < tasks.length){
           if(tasks.includes(ind)){
              tasks.splice(ind,1,timeTask)
           }
         }

       ;break;
       case 'Drop':
         let indexHour = +item;
         if(indexHour >= 0 && indexHour < tasks.length){
           if(tasks.includes(indexHour)){
              tasks.splice(indexHour,1,-1);
           }
         }
       ;break;
       case 'Count':
         if(item === 'Completed'){
           let countCompleted = tasks.filter(el => el === 0);
           console.log(countCompleted.length);
        }
        else if(item === 'Incomplete'){
           let countIncomplete = tasks.filter(el => el > 0);
           console.log(countIncomplete.length);
        }
          else if(item === 'Dropped'){
           let countDropped = tasks.filter(el => el < 0);
           console.log(countDropped.length);
         }
       ;break;
     }
   }
   let incompleteTasks = tasks.filter(el => el > 0);
   console.log(incompleteTasks.join(' '))
}

solve([
  '1 -1 2 3 4 5',
  'Complete 4',
  'Change 0 4',
  'Drop 3',
  'Count Dropped',
  'End'
]
);

// solve([
//     '1 2 3 4 5 4 0 3 2 1',
//     'Complete 0',
//     'Complete 1',
//     'Complete 2',
//     'Drop 3',
//     'Change 4 1',
//     'Count Completed',
//     'End'
//   ]
//   )