in reply to Re^3: Subtracting Lists
in thread Subtracting Lists

I would suggest that educated_foo's (++) is the most portable,readable one with no dependencies.

That isn't the OP's criteria ("I am trying to find the fastest (not necessarily most elegant) way"). I think both his and mine are similarly fast, however.

I specifically avoided undef @h{}; for being cryptic.

I did appreciate the combining the extraction of the result into the operation itself, but it's less modular (i.e. complicates things if you want to work with the resulting set).

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Re^5: Subtracting Lists
by educated_foo (Vicar) on Jun 02, 2008 at 16:38 UTC
    I specifically avoided undef @h{}; for being cryptic.
    That's at least part of the reason I used it ;). It's a weird idiom, but useful when you want to use hashes as sets rather than maps, so I think more people should be introduced to it. Besides, it creates fewer scalars and executes fewer operations than other methods, and the OP did say "fastest". That said, I like your solution (to a slightly different problem) -- simple, terse, and no bizarro modules.
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