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Making the "simple" key smaller might be possible in many cases, but the calculation method to getting it to "smallish" will probably defeat the gain over hashes.

The subtraction of a simple constant makes almost no difference:

$t=time; $a[ $_-123 ] = $_ for 123 .. 123+1e6; print time() - $t; prin +t total_size \@a;; 0.252718925476074 32388792 $t=time; $h{ $_ } = $_ for 123 .. 123+1e6; print time() - $t; print to +tal_size \%h;; 0.625 112278277
To me the most important reasons to use arrays are: 1) Data must stay in original order 2) Data is not guaranteed to be unique 3) The "target" API works only with lists/arrays

Of those, the first two are moot. If the data can be stored in an array, then it can also be stored in a hash whilst meeting both of those criteria.

That is, it is the keys of a hash that must be unique, and that is easily achieved by incrementing a integer variable as you build the hash. And once you've done that retrieval in insertion order is just a matter of iterating the keys.

For your third criteria, if the APIs don't accept hashes, then there is no choice.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re^3: An irrational coding choice found by BrowserUk
in thread An irrational coding choice found by Lady_Aleena

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