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...
Add two numbers
Right and wrong
Scoring for oriented dominoes
Reverse the elements of an array
Cache me Outside
Clock Hand Angle 1
Solve the Sudoku Row
Give the Shortest Path Through The Maze
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