Require a field — practice exercise

What you'll be asked to do

1. 1.Require a fieldexercise · easy · 10 min

   Make the email field required.

   Passes when: Make the email field required.

2. 2.Validate with a patternexercise · easy · 10 min · practice plan

   Require a 5-digit code using pattern.

   Passes when: Require a 5-digit code using pattern.

3. 3.Set a minimumexercise · easy · 10 min · practice plan

   Require a number of at least 1.

   Passes when: Require a number of at least 1.

4. 4.Set a maximumexercise · easy · 10 min · practice plan

   Cap the number at 10.

   Passes when: Cap the number at 10.

5. 5.Combine validation rulesexercise · medium · 10 min · practice plan

   Require an email field with a minimum length.

   Passes when: Require an email field with a minimum length.

6. 6.Fix validation left to JavaScript onlybug fix · easy · 8 min

   The field has no required attribute at all.

   Passes when: The field has no required attribute at all.

7. 7.Fix the wrong pattern attributebug fix · easy · 8 min · practice plan

   The attribute is pattern, not regex.

   Passes when: The attribute is pattern, not regex.

8. 8.Fix min used on a text fieldbug fix · easy · 8 min · practice plan

   min only applies to numeric and date inputs.

   Passes when: min only applies to numeric and date inputs.

9. 9.Fix the swapped boundsbug fix · easy · 8 min · practice plan

   The maximum is smaller than the minimum.

   Passes when: The maximum is smaller than the minimum.

10. 10.Fix the wrong length attributebug fix · easy · 8 min · practice plan

    A minimum length uses minlength.

    Passes when: A minimum length uses minlength.

Between them these tasks cover required, pattern, min and max and type validation.

Looking for a different chapter? See every practice set, or switch to the interview theory questions.