Sum all numbers challenge not passing

JavaScript
1

Hi, can someone help me with this algorithm pls ? it logs out the correct answers for the conditions in the challenge but when i return the output it does not pass any conditions . what is wrong in my program?
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range

3

sure thanks.

function sumAll(arr) {
  var lower = arr[0];
  var upper = arr[1];
  var sum = [];
  if (lower < upper){
  while (lower <= upper){
    sum.push(lower++);
  }
  console.log(sum);
  } else {
    while (lower >= upper){
      sum.push(lower--);
    }
    console.log(sum);
  }
  var add = function(x,y){
    return x+y;
  }
  console.log(sum.reduce(add)) ;
}

sumAll([1, 4]);
5

When I use return the challenge fails . I am still not able to figure out what is wrong with my code . even though it logs out the correct answer to the console , it fails to return the same.
could you pls help?

7 
function sumAll(arr) {
  var lower = arr[0];
  var upper = arr[1];
  var sum = [];
  if (lower < upper){
  while (lower <= upper){
    sum.push(lower++);
  }
  return sum;
  } else {
    while (lower >= upper){
      sum.push(lower--);
    }
    return sum;
  }
  var add = function(x,y){
    return x+y;
  }
  return sum.reduce(add)) ;
}

sumAll([1, 4]);
9

Thank you .it passed now.