Smallest Common Multiple - stuck

JavaScript
1

I’ve just about got this but I’m struggling with the last test. All the other tests work and the array I create looks ok
Any idea what I’ve done wrong?

function smallestCommons(arr) {

  var newArr = [];
  arr.sort(function(a, b){
    return a - b;
  });
  console.log(arr);
  for (var i = arr[0] ; i <= arr[1]; i++){
    newArr.push(i);
    console.log(newArr);
  }
function gcd(i, j) {
    if (j === 0)
        return i;
    else
        return gcd(j, i % j);
    }
    var lcm = newArr[0];
    for (var i = newArr[0]; i < newArr.length; i++){
      var ans = gcd(lcm, newArr[i]);
      lcm = (lcm * newArr[i]) / ans;
      console.log(lcm);
    }
  
  return lcm;
}


smallestCommons([23, 18]);