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Because all of the map-based methods construct, copy and later discard, multiple, intermediary lists on their way to constructing the hash.

And the costs of doing large numbers of small memory allocations and deallocations add up; especially if they memory manager has to go to the OS a couple of times to expand the process memory pool.

Using for avoids constructing many of the intermediary lists.


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In reply to Re^4: better array to hash conversion by BrowserUk
in thread better array to hash conversion by perltux

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    [shmem]: $list_addiction should be $list_addition
    Discipulus loose the tozzetto party!
    [shmem]: .oO( addition of cookies for addiction to cookies )
    [Lady_Aleena]: Other than my typos shmem. 8)
    [shmem]: otherwise fine
    [Discipulus]: tozzetti & vinsanto
    [Lady_Aleena]: The whole line is push @line, ref($list_addition ) ? @$list_addition : $list_addition if $list_addition;
    [Lady_Aleena]: And I forgot to do the array check, I'm such a doofus today.
    [Lady_Aleena]: push @line, ref($list_addition ) eq 'ARRAY' ? @$list_addition : $list_addition if $list_addition; #trying again
    [shmem]: Discipulus: yummy. I like those. Didn't have them for some time now, forgot the name. Should go get some...

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