[theiasson]

That's a real bummer. Is there any way the author can prevent this? Can he generate random indexes that don't repeat while keeping this random number generator code public?

[grenoire]

The only way to address this would be validating the answers server-side. Any information you leak in the locally executed code can be discovered without much effort.

I think Wordle doesn't server-side validate because of volume, and also because it's a fun little game and cheating brings you nothing of value.