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Re^4: Perl oddities

by Anonymous Monk
on Mar 01, 2005 at 16:16 UTC ( #435504=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Perl oddities
in thread Perl oddities

No, you don't need the +:

print map {"$_",}, qw/foo bar/
works as well, although you need more characters. I don't think there is any case in Perl where you need unary minus for disambiguation where you can't disambiguate in another way using 2 or 3 other keystrokes.

Unary plus is just a convenience, not a requirement.


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Re^5: Perl oddities
by hardburn (Abbot) on Mar 01, 2005 at 16:18 UTC

    Quoting is not an identity function in Perl.

    "There is no shame in being self-taught, only in not trying to learn in the first place." -- Atrus, Myst: The Book of D'ni.

      Quoting is not an identity function in Perl.

      It's not, but if you're going to use them as hash keys, they get quoted anyway:

      perl -MDevel::Peek -e '$a = 1; Dump ($a); %a = map +{$_}, $a; Dump ($a +)' SV = IV(0x8192edc) at 0x8191dc4 REFCNT = 1 FLAGS = (IOK,pIOK) IV = 1 SV = PVIV(0x8184888) at 0x8191dc4 REFCNT = 1 FLAGS = (IOK,POK,pIOK,pPOK) IV = 1 PV = 0x818b5b8 "1"\0 CUR = 1 LEN = 2

      perl -MDevel::Peek -e '$a = 1; Dump ($a); %a = map {"$_",}, $a; Dump ( +$a)' SV = IV(0x8192edc) at 0x8191dc4 REFCNT = 1 FLAGS = (IOK,pIOK) IV = 1 SV = PVIV(0x8184888) at 0x8191dc4 REFCNT = 1 FLAGS = (IOK,POK,pIOK,pPOK) IV = 1 PV = 0x818b5b8 "1"\0 CUR = 1 LEN = 2
      No difference.

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