I don’t know how to solve this challenge except in this way.

According to the challenge, it says; Modify the function `abTest`

so that if `a`

or `b`

are less than `0`

the function will immediately exit with a value of `undefined`

.

I would love if someone can help. Thanks.

**Your code so far**

```
// Setup
function abTest(a, b) {
// Only change code below this line
if (a < 0 || b < 0) {
return "undefined";
}
// Only change code above this line
return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 2));
}
// Change values below to test your code
console.log(abTest(-2,2));
```

**Your browser information:**

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36`

.

**Link to the challenge:**

https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/return-early-pattern-for-functions