String#tr - Problem in Code or Documentation?

[Wolfgang Nádasi-Donner]

Moin, moin!

The description for "tr" does not state what should happen, if the
second string ist an empty string. In the actual implementation all
character from the object string will be deleted, if they appear in the
first parameter string.
irb(main):001:0> 'Hello, world!'.tr('aeiou','')
=> "Hll, wrld!"
My question is: Is this an Error in the implementation or a special
case, which is not documented?

Wolfgang Nádasi-Donner

 

[Wolfgang Nádasi-Donner]

If an empty string is passed on as the to_str, simply return the C
equivalent of String#delete(from_str).

Hope that _does_ help this time,

Fine - thank you very much! It means, that it is done by intention.

WoNáDo