I'm trying to use a switch statement as follow. But even if status is 301, the case case (status > 200 && status < 400) is ignored and the result is the "default" case.
What am I doing wrong? Is it not possibile to use conditions in case statements?
status = 301;
switch (status) {
case 0:
case 200:
console.log('200');
break;
case (status > 200 && status < 400):
console.log('200-400');
break;
case 404:
console.log('404');
break;
default:
console.log('Si è verificato un errore irreversibile.');
}
At the end I solved with a simple if, but I would like to know why this doesn't work.
That's not how switch/case works in JavaScript; you can only match values, not conditions. What happens here is that status > 200 && status < 400 evaluates to true, and true is obviously not the same as 301.
Indeed a simple if/else if/.../else chain is the usual solution here.
This can be achieved by following:
const status = 301;
switch (true) {
case status === 0:
case status === 200:
console.log('200');
break;
case (status > 200 && status < 400):
console.log('200-400');
break;
case status === 404:
console.log('404');
break;
default:
console.log('Si è verificato un errore irreversibile.');
}
But I agree with @Thomas's suggestion, we should prefer using the if/else chain for these kind of problems.