Vigenère cipher: Difference between revisions

m
Line 741:
 
select
when meth.lower.abbrev('encipher'.abbrev(meth.lower, 1) then df = 1
when meth.lower.abbrev('decipher'.abbrev(meth.lower, 1) then df = -1
otherwise signal IllegalArgumentException(meth 'must be "encipher" or "decipher"')
end
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