Re^3: Optimization, side-effects and wrong code

It is noted in the POD for keys:

As a side effect, calling keys() resets the HASH's internal iterator, see each. (In particular, calling keys() in void context resets the iterator with no other overhead.)

Examine what is said, not who speaks.

"Efficiency is intelligent laziness." -David Dunham
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Comment on Re^3: Optimization, side-effects and wrong code

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Re^4: Optimization, side-effects and wrong code by Mutant (Priest) on Sep 30, 2004 at 14:28 UTC
I had the misfortune of getting caught out by this the other day. I decided to call 'keys' inside a while (each) loop... this reset the pointer, causing an infinite loop :/	[reply]