Re^4: self-feeding infinite loop


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Re^4: self-feeding infinite loop

by syphilis (Archbishop)

on Aug 18, 2007 at 14:33 UTC ( [id://633486]=note: print w/replies, xml )

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in reply to Re^3: self-feeding infinite loop
in thread self-feeding infinite loop

But you're definitely in the territory of "unpredictable behaviour"

I may be being somewhat picky (or I may even be downright wrong), but I don't see any "unpredictable behaviour" there. I agree that one needs to be careful when modifying an array by iterating over the same array, but the following does behave predictably:

use strict;
use warnings;
my @array = ('a');
foreach (@array) {
    push @array,'a';
    print"@array\n";
    sleep(1); # so we can absorb what's happening
}
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Cheers,
Rob

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Re^5: self-feeding infinite loop
by Errto (Vicar) on Aug 18, 2007 at 18:03 UTC

perlsyn

If any part of LIST is an array, foreach will get very confused if you add or remove elements within the loop body, for example with splice. So don't do that.

myself

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