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Re: Why doesn't Perl provide %_ as the hash equivalent of @_ in subs?

by ikegami (Pope)
on Sep 26, 2013 at 14:12 UTC ( #1055840=note: print w/replies, xml ) Need Help??

in reply to Why doesn't Perl provide %_ as the hash equivalent of @_ in subs?

It would be silly to always create a hash from the arguments.

  • Extremely expensive where it's not needed.
  • Causes warnings if you pass undef at even indexes.
  • Causes warning if you pass an odd number of arguments.
  • Useless for methods.
  • Useless for sub that have any positional parameters.

So either create it yourself (local %_ = @_; or alias local %_ = @_;) when it's acceptable, or create an attribute you can specify on a sub which does it for you (e.g. sub foo :named_args { ... }).

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