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Review Summary
I am approving your solution because the core functionality and all required behaviors for isIsogram are correctly implemented and thoroughly tested. Your tests cover positive and negative cases, including the required examples ('playgrounds', 'look', 'Adam', 'Oops') and the empty-string case, and they use Jest expectations properly. This means the task’s functional requirements and testing requirements are satisfied.
One minor improvement you could make (not a blocker) is to refine the generic test description in src/isIsogram.test.js (the one that currently says something like “should return false for incorrect word”) so it explicitly names the input, for example: should return false for 'look'. This will make it clearer which scenario failed if a test breaks in the future and better aligns with the requirement that each test description be clear as well as unique. Overall, your work shows good attention to the problem requirements—nice job.
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Footnotes
| expect(isIsogram('playgrounds')).toBe(true); | ||
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| it('should return false for incorrect word', () => { |
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The test description is generic. The task requires each test case description to be clear and unique — consider naming this explicitly (for example: should return false for 'look') so readers immediately know which case is tested. This will improve clarity and directly satisfy the requirement about clear test descriptions.
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