Any of those executes at well over 300000 per second. How many seconds do you think you'll spend debugging a "failure to use exists"? Is the performance gain worth that? How many times would you have to run this program before the execution time gained exceeds the debugging time lost? How do you value your time versus execution time (note that you're coding in Perl, not C)?

In reply to Re^4: Effeciency of key-only hash by kyle
in thread Effecicncy of key-only hash by brycen

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