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Re^2: Foreach Loops

by spurperl (Priest)
on Mar 16, 2005 at 10:58 UTC ( #439901=note: print w/ replies, xml ) Need Help??

in reply to Re: Foreach Loops
in thread Foreach Loops

Such a get_index_of operator would be inefficient, hence it doesn't make much sense for Perl to have it.

Think about it - an array is a linear structure meant specifically for random-access of index->element. To find the index of some element you will either have to go through the array looking for the element - this is O(N). You can have more time-efficient algorithms at the cost of space, like having a "mirror" hash of element->index.

As for your original problem, I also sometimes feel a little itch when I have to give up foreach once access to elements other-than-the-current is required.

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