**For loop gives undefined value**

In the smallest common multiple challange, I created 2 arrays:

- one where the range of numbers between the parameters in arr are listed (newArr),
- and one where multiples of the bigest number in arr are listed (multipleArr) until the largest possible value which is the multiplication of all the numbers in the range.

When I loop through both arrays to find the multiple that can be divided with all the numbers in the range, I got undefined as result. Why is that?

```
**The code**
```

```
function smallestCommons(arr) {
arr = arr.sort((a,b) => a-b);
var newArr = [];
for (let i=arr[0]; i<=arr[1]; i++){
newArr.push(i)};
console.log(arr);
console.log(newArr);
var upperBound = 1
for (let a = arr[0]; a <= arr[1]; a++) {
upperBound *= a
}
console.log(upperBound);
var multipleArr=[];
for (var j=arr[1]; j <= upperBound; j += arr[1]) {
multipleArr.push(j)
};
console.log(multipleArr)
for (var n = 0; n < multipleArr.lenght; n++) {
for (var m = 0; m < newArr.length; m++) {
if (multipleArr[n] % newArr[m] === 0) {
return multipleArr[n]
}
}
}
}
console.log(smallestCommons([5,1]));
```

```
**Your browser information:**
```

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36`

**Challenge:** Smallest Common Multiple

**Link to the challenge:**