Constants in a JavaScript switch statement?

Question

Network administration

I recently started learning JavaScript and I'm having trouble with the switch construct. I can’t figure out the constants in the switch construction, tell me if it’s possible to do this:
switch(x) {
case x >= 20 && x < 60:
console.log("Option 1.");
break;
case x > 60:
console.log("Option 2.");
break;
case x < 20:
console.log("Option 3.");
break;
default:
console.log("Invalid option.");
}
or is a constant always an integer or a string? and how then to use the comparison operators in this example?