arrayTask

function solution(arr){
    let mainArr = arr.shift().split(' ');
    let result = '';
 for(let elements of arr){
     if(elements === 'End'){
         break;
     }
     let token = elements.split(' ');
     let command = token.shift();

     switch(command){
         case 'Switch':
            let ind = Number(token[0]);
            if(ind < 0 || ind >= mainArr.length){
                break;
            }
            if(mainArr.indexOf(ind) === -1){
                  if(mainArr[ind] > 0){
                    //  mainArr[ind] *= -1;
                    let num = -Math.abs(mainArr[ind]);
                    mainArr.splice(ind,1,num);
                  }else{
                  //  mainArr[ind] *= 1;
                    let num = Math.abs(mainArr[ind]);
                    mainArr.splice(ind,1,num);
                  }

            }

         ;break;
         case 'Change':
          let index = Number(token[0]);

          if(index<0 || index >= mainArr.length){
              break;
          }else{
            if(mainArr.indexOf(index) === -1){
                let newIndex = Number(token[1]);
                  mainArr.splice(index,1,newIndex);

            }
          }

         ;break;
         case 'Sum':
             switch(token[0]){
                 case 'Negative':
                 let sumNegative = 0
                 let negative = mainArr.filter(a => a < 0);

                 for(let ind of negative){
                     sumNegative += Number(ind);
                 }
                 console.log(sumNegative);

                 ;break;
                 case 'Positive':
                 let sumPositive = 0;
                 let positive = mainArr.filter(a => a > 0);
                 for(let ind of positive){
                     sumPositive += Number(ind);
                 }
                 console.log(sumPositive);
                 ;break;
                 case 'All':
                 let sumAll = 0;
                 for(let ind of mainArr){
                     sumAll += Number(ind);
                 }
                 console.log(sumAll);
                 ;break;
             };break;
     }

 }

 for(let i = 0;i < mainArr.length;i++){
     if(mainArr[i] >= 0){
       result += mainArr[i] + ' ';
     }
 }
  console.log(result)
}
solution([
    //  '1 2 3 4 5',
    //  'Switch 4',
    //  'Change 0 -3',
    //  'Sum Negative',
    //  'End'

    '1 2 3 4 5 4 3 2 1 0',
    'Switch -4',
    'Change 13 0',
    'Switch 0',
    'Sum All',
    'End'
   ])