Practice · 1 of 1
Kill the Mutants
CHALLENGE
Difficulty: advanced+25 XP
Implement the validator issues exactly per the contract. The graded tests are a mutation suite: boundary mutants (< vs <=, missing edge chars) must fail — your implementation has to be exact at every boundary to kill them all.
Press Submit to check your solution.
Back to lesson: Practice: Practice: Properties & Mutants