That depends on the loop (for,while,map,...) and the iterated thing.

Could you be more specific, or at least point to another language which can do this?

update

Here a counter example to explain one difficulty:

Consider a while loop iterating over human input, how should the loop know in advance that the user will stop the input in the next iteration?

while ( my ($in) = human_input() ) {
    do_something($in);
}

[download]

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re: Perl's feature to determine, in current point of loop, that this is the last one? (updated: while unpredictable) by LanX
in thread Perl's feature to determine, in current point of loop, that this is the last one? by Anonymous Monk

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