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    thank you :)

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    You should return the answer not print it to the console.

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    Did anyone had the same problem? the script seems to work on codepen but when I put it here everything goes 'undefined' I've added a line to catch the console log and the results are the log is the same as "expected" by codewars.. not sure what I should do. :)

    Log
    true
    Expected: 'true', instead got: 'undefined'

    Log
    false
    same chars may not be adjacent - Expected: 'false', instead got: 'undefined'

    Log
    false
    same chars may not be same case - Expected: 'false', instead got: 'undefined'

    Log
    false
    Expected: 'false', instead got: 'undefined'

    Log
    true
    an empty string is a valid isogram - Expected: 'true', instead got: 'undefined'