const sumAll = function(min, max) {
  if (min < 0 || max < 0) return "ERROR";
  if (typeof min !== "number" || typeof max !== "number") return "ERROR";
  if (min > max) {
    const temp = min;
    min = max;
    max = temp;
  }
  let sum = 0;
  for (let i = min; i < max + 1; i++) {
    sum += i;
  }
  return sum;
};

// A more advanced way using reduce method

// const sumAll = function(min, max) {
//   if(min < 0 || max < 0 || typeof min !== 'number'|| typeof max !== 'number' ) return 'ERROR';
//   if(min > max){
//     const temp = min;
//     min = max;
//     max = temp;
//   }
//   const arr = [];
//   for(i= min; i <= max; i++){
//     arr.push(i);
//   }
//   return arr.reduce((a, b) => a + b);
// }


module.exports = sumAll;