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Review Summary
Excellent work on the tests for the isIsogram function! I am approving your solution as it comprehensively covers all the requirements, including handling case-insensitivity and edge cases like the empty string.
As a minor suggestion for future improvement, the test description for 'Oops' in src/isIsogram.test.js mentions 'non-consecutive letters'. After being made lowercase, the repeating 'o's are actually consecutive. While the test itself is perfectly valid, using an input like 'aba' would align more precisely with that specific description.
This is just a small point on clarity, and your overall implementation is solid. Keep up the great work!
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Footnotes
| expect(isIsogram('look')).toBe(false); | ||
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| test('returns false when a word contains repeating non-consecutive letters', () => { |
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This is a great test case that correctly checks for case-insensitivity. However, the description ...repeating non-consecutive letters can be slightly confusing here. In 'Oops', the repeating letters ('o' and 'o' after making them lowercase) are actually consecutive. Your test case for 'Adam' is a perfect example of non-consecutive repeating letters.
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JEST requirements met