Why i can not use switch?

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;
// Only change code above this line

return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 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:

That is not valid syntax for a switch. I switch matches a single value against several possible values. A switch is not designed to work on a pair, and a switch is not designed to work on conditions.

If you are testing conditions, you should really use if.

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