Erik Veenstra wrote:
> Replace "check(newString)" by "finalString = check(newString)"
> (line 33). Or get rid of "return finalString" (line 37).
> 
> What's the advantage of toBase36, compared to the built-in
> to_s(36)?
> 
>  p toBase36(30)
>  p 30.to_s(36)
> 
> gegroet,
> Erik V. - http://www.erikveen.dds.nl/

I simply didn't know about to_s(36)
  (I didn't see that in the Pickaxe)

It works! This is great, thanks.
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