FAQ: The State Hook - Use State Setter Outside of JSX

This community-built FAQ covers the “Use State Setter Outside of JSX” exercise from the lesson “The State Hook”.

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FAQs on the exercise Use State Setter Outside of JSX

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Interestingly, it appears that the way the code is written currently doesn’t work exactly as desired. We start with an empty string as the initial state of the input field. That’s fine. If we try to type in a letter or any character other than a digit, the validPhoneNumber denies this change via the regex check. This is also as intended. Once we start entering digits, the regex /^\d{1,10}$/ matches the digits and the field starts showing the new phone number. If we try to delete the digits, it seems to work BUT we can’t delete the first digit. Suppose we start typing in 3219 and then decide to change the phone number, we can get rid of the 219 but not the 3. If we try to delete the first digit, the validPhoneNumber won’t let us make this deletion as an empty string will fail the regex test. So, as things stand currently, we can’t delete/edit the very first digit of the phone number.

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