Re^4: Perl oddities

No, you don't need the +:

    print map {"$_",}, qw/foo bar/
[download]

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.

Comment on Re^4: Perl oddities Download Code

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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.	[reply]
Re^6: Perl oddities by Anonymous Monk on Mar 01, 2005 at 16:49 UTC
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` [download] `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` [download] No difference.	[reply] [d/l] [select]


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