**Tell us what’s happening:**

Hello, everyone, Please tell me why I can not use switch ? Thank you.

the hint code` " if (a < 0 || b < 0) { return undefined; } "`

/

**Your code so far**

```
// Setup
function abTest(a, b) {
// Only change code below this line
switch (a, b) {
case a < 0:
case b < 0:
return undefined;
break;
}
// Only change code above this line
return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 2));
}
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/90.0.4430.212 Safari/537.36`

.

**Challenge:** Return Early Pattern for Functions

**Link to the challenge:**