I prefer number 2 because it is specific to the context of returning true or false.
Number 1 isn't bad but it's more appropriate for doing more steps of validating the email other than true or false.
What about number 3?
emailIsValid seems to assume the email is already valid.
I try to be more specific when I write; keep the structure close to english or native language to avoid cognitive overload.
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I prefer number 2 because it is specific to the context of returning true or false.
Number 1 isn't bad but it's more appropriate for doing more steps of validating the email other than true or false.
What about number 3?
emailIsValid seems to assume the email is already valid.
I try to be more specific when I write; keep the structure close to english or native language to avoid cognitive overload.