Nice expression for the usage test. Maybe one can add function "dec2base", cause the return type is a String.
The problem description should mention that dec2base isn't allowed either.
This will fail to detect certain palindromes which contain zero e.g. 10101 however the test suite doesn't (yet) contain any such.
There's something strange with the Cody test suites today...
Remove any row in which a NaN appears
Remove the two elements next to NaN value
Permute diagonal and antidiagonal
Reverse the Words (not letters) of a String
Next Lower Power of B
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