function Arrays_sum(array1, array2)   
{  
  var result = [];  
  var ctr = 0;  
  var x=0;  
  
  if (array1.length === 0)   
   return "array1 is empty";  
  if (array2.length === 0)   
   return "array2 is empty";     
  
 while (ctr < array1.length && ctr < array2.length)   
  {  
    result.push(array1[ctr] + array2[ctr]);  
    ctr++;  
  }  
  
 if (ctr === array1.length)   
 {  
    for (x = ctr; x < array2.length; x++)   {  
      result.push(array2[x]);  
    }  
  }   
  else  
  {  
  for (x = ctr; x < array1.length; x++)   
    {  
      result.push(array1[x]);  
    }  
  }  
  return result;  
}  
  
console.log(Arrays_sum([1,0,2,3,4], [3,5,6,7,8,13]));  