Implement task solution

[OlhaLishenko]

No description provided.

[mateacademy-ai-mentor]

Review Summary

I am approving your solution because all core requirements for the isIsogram tests are clearly met and the suite correctly exercises the specified behaviors. You cover the empty string, a word with no repeating letters, repeated letters, case-insensitive repeats, and non-consecutive repeats exactly as described in the task, and each test has a clear, distinct description. The additional test that checks that null/undefined cause an error is consistent with the current implementation (which calls toLowerCase()), so it does not break functionality or the required behavior.

For future improvement (not required to pass): you might consider making the behavior for non-string inputs explicit in isIsogram (for example, by validating the input type) and then adjusting the test to assert that explicit behavior. Also, when checking booleans, toBe(true) / toBe(false) is a bit more idiomatic than toEqual(true) / toEqual(false), though both work. Overall, your tests are well-structured, readable, and aligned with the task, so you can confidently move forward from here.

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