Well KOUIS ... Nice Question that Frequently Asked ... The Kata's Solution you've Posted or ** Published** Did Satisfied the Example Test Cases Only ... but when It comes To Random Test Cases , it did not , so It's displays a message With ** Fialed To Pass the Random test Cases ** .

In Other words , Try scanning The Whole Kata Test Cases and Descrpition again To Refine and Refactor Your code , and Block those Holes in it .

Hope That Helps ... Regards Zizou

console.log() already prints to the output box.

As opposed to having to do it in the browser console itself? I think an in-page console would be swell.