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rcaputo (9040)

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Journal of rcaputo (9040)

Sunday September 06, 2009
01:51 AM

Help me rename Lexical::Persistence

[ #39588 ]

"Persistence" implies that data will be saved and loaded from disk, to a database, or some other persistent storage. That's not what the module does, so I think it needs a new name.

Lexical::Persistence objects are closures that make the values of lexical variables stick (or persist) in everything they call. In the following example, the Lexical::Persistence object makes sure that getter()'s version of $x contains the value stored by setter().

use Lexical::Persistence;

my $lp = Lexical::Persistence->new();

sub setter { my $x = "some value" }
sub getter { print my $x, "\n" }

Lexical::Persistence's closures are objects. Programs may examine and manipulate their contents between calls. The following code displays something like this:

My mind is going. I can feel it.
My is going. I can feel it.
My is going. I feel it.
My going. I feel it.
My going. I feel
My I feel
My I

Here's the example:

use Lexical::Persistence;

my $lp = Lexical::Persistence->new();
    _ => {
        '@mind' => [qw(My mind is going. I can feel it.)]

while (1) {
    my $mind = $lp->get_context("_")->{'@mind'};
    splice @$mind, rand(@$mind), 1;
    last unless @$mind;

sub display {
    my @mind;
    print "@mind\n";

So, what would be a better name for this module?

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  • You need a word that's not so heavy as "persistent", which is also already in use with a different meaning, as you say.

    So, here are some words for you:

    • sticky
    • static
    • state (I don't like this one, but that's what perl 5.10 uses)

    My favorite is "sticky", which has a very informal feel about it.

    Also, you may want to try out the Reverse Dictionary Lookup [], throw some words at it, and see how you like the alternative words that it comes up with.

  • Lexical::Environment