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

by BrowserUk (Patriarch)
on Sep 29, 2004 at 15:08 UTC ( [id://395106]=note: print w/replies, xml ) Need Help??

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in reply to Re^2: Optimization, side-effects and wrong code
in thread 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
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon
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Re^4: Optimization, side-effects and wrong code
by Mutant (Priest) on Sep 30, 2004 at 10:28 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 :/
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