FAQ 4.46 How do I handle linked lists?

Discussion in 'Perl Misc' started by PerlFAQ Server, Jan 17, 2011.

  1. This is an excerpt from the latest version perlfaq4.pod, which
    comes with the standard Perl distribution. These postings aim to
    reduce the number of repeated questions as well as allow the community
    to review and update the answers. The latest version of the complete
    perlfaq is at http://faq.perl.org .

    --------------------------------------------------------------------

    4.46: How do I handle linked lists?

    (contributed by brian d foy)

    Perl's arrays do not have a fixed size, so you don't need linked lists
    if you just want to add or remove items. You can use array operations
    such as "push", "pop", "shift", "unshift", or "splice" to do that.

    Sometimes, however, linked lists can be useful in situations where you
    want to "shard" an array so you have have many small arrays instead of a
    single big array. You can keep arrays longer than Perl's largest array
    index, lock smaller arrays separately in threaded programs, reallocate
    less memory, or quickly insert elements in the middle of the chain.

    Steve Lembark goes through the details in his YAPC::NA 2009 talk "Perly
    Linked Lists" ( http://www.slideshare.net/lembark/perly-linked-lists ),
    although you can just use his "LinkedList::Single" module.



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    PerlFAQ Server, Jan 17, 2011
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