I have been trying to write a function that takes an array of usernames and return true if they are all valid and false if any are not valid. A valid username:
- is at least 5 characters long
- may only contain lowercase letters, numbers and underscores
- is no longer than 20 characters
eg - ["validuser_72_", "valid", "invaliduser_72*", "1234567", "val__67"] returns false.
- ["validuser_72_", "valid", "1234567", "val__67"] returns true.
The following code will pass the tests in my test suite:
function checkUsernames(users) {
if (!users || users.length === 0) return false;
const regex = /[A-Z\W]/g;
return users.every(
(user) => !regex.test(user) && user.length < 21 && user.length > 4
);
}
However when I add a console.log, as per the code below, to test my inputs it seems to be affecting the return value in unpredictable ways.
function checkUsernames(users) {
if (!users || users.length === 0) return false;
const regex = /[A-Z\W]/g;
console.log(users.every(
(user) => !regex.test(user) && user.length < 21 && user.length > 4
));
return users.every(
(user) => !regex.test(user) && user.length < 21 && user.length > 4
);
}
Can anyone explain why console logging in this way should have any affect on the return value?
Thanks!
