Which type of validation check can be used to check if a password is at least 8 characters long?

Question

BlackTom AI · Accepted Answer

To determine which validation check is appropriate for ensuring a password is at least 8 characters long, we should evaluate what each option verifies.
Option a: Presence check. This type of check verifies that a value exists and is not empty, but it does not measure the actual length of the value. A password could be present yet be only one or two characters long, so a presence check alone would not enforce the 8-character minimum.
Option b: Length check. This is the one that explicitly assesses the number of characters in the input. By setting a minimum length of 8, it ensures that the password must be at least 8 characters long, which directly satisfies the requirement.
Option c: Range check. A range check typically validates that a numeric value falls within a specified minimum and maximum range (e.g., age between 18 and 65). It does not apply to the count of characters in a string unless the string is being interpreted numerically, which is not the standard use for password length validation.
Option d: Data type check. This check ensures the input is of a particular data type (e.g., string, integer). While a password should be treated as a string, a data type check by itself does not enforce any minimum length; it only confirms the type, not the length.
In summary, among the listed options, the one that directly enforces a minimum character count for a password is the length check, since it targets the exact criterion of being at least 8 characters long.

Which type of validation check can be used to check if a password is at least 8 characters long?

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