Equal Sums

function maxNumber(arr){
 let indexOfEl = -1;

 for(let i = 0;i < arr.length;i++){
   let rightSum = 0;
   let leftSum = 0;

   for(let j = i - 1;j >= 0;j--){
      leftSum += arr[j];
   }

   for(let j = i + 1;j < arr.length;j++){
      rightSum += arr[j];
   }

   if(leftSum === rightSum){
      indexOfEl = i;
   }
 }
   if(indexOfEl !== -1){
     console.log(indexOfEl);
   }else{
     console.log('no');
   }

}