John W. Krahn wrote: > Wiggins d'Anconia wrote: > >>Robert wrote: >> >>>When Perl is doing this comparison is it doing it line by line (like an >>>actual DIFF) or is it putting the lines into an "array" and the checking >>>that array against the second file? >> >>Well yes and no, to both. It is storing the lines temporarily, but it is >>storing them to a hash, not an array. Then it is checking them line by >>line. Depending on the purposes there are several large differences >>between the code and a "DIFF". For one, order is not maintained in a >>hash so it is really checking just to see if the line did exist in the >>first file, rather than that they are in the same order, which matters >>to a diff. Secondly it is checking to see if that line is in fact Perly >>true, so if a line consisted of just a 0 it would be false and return a >>false negative. > > > No, the line contents are stored in the hash key but the check is done on the > hash value which is always one. > > > John
Ah, good point. Attention to detail.... http://danconia.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
