Golfers,
This list has been a tad quiet for a while so I thought I'd throw in a golfy puzzle.
For some reason the keys on my keyboard temporarily rearranged themselves today and a
quick one-liner I was writing didn't do what I expected; in fact it did nothing at
all. So I added a -w flag and I got 4 separate warnings. I thought, 4 warnings ain't
good enough, I wanted more!
In a few minutes I had a 9 byte one liner that produced 7 distinct warnings when run
with -w but did nothing without -w. That's 0.77 warnings per byte of code, not bad but
I'm sure there's more to be found. Sure a simple perl -we 'a' gives two warnings for
one byte, but that seams a little too trivial.
Puzzle: Write a one-liner longer than (say) 3 bytes that can improve on 0.77 distinct
warnings per byte of code. The program should be -c valid, output nothing without -w
and sound the alarm as much as possible with -w.
For those who like sand-traps, I suggest you shouldn't count multiple messages that
give the same warning for different quoted strings. For example perl -we "a,b" gives
four warnings (1.3/byte) but only scores two distinct ones (0.66/byte). Nor can you
count the same warning on multiple lines of input. The following will hopefully give
a true distinct warnings score.
perl -we 'yourcode' 2>&1 | perl -ne 's/\042.*\042//;s/at
-e.*$//;$x{$_}++;END{print 0+keys%x}'
Cheers,
Alistair
PS please excuse the \042 in the regex I was chopping between Cygwin and cmd.exe and "
in cmd is a complete #£&^%$^!
__SPOILER__GAP__
__
D:\>perl -ce "%$A==$@,z"
-e syntax OK
D:\>perl -e "%$A==$@,z"
D:\>perl -we "%$A==$@,z"
Unquoted string "z" may clash with future reserved word at -e line 1.
Useless use of numeric eq (==) in void context at -e line 1.
Useless use of a constant in void context at -e line 1.
Name "main::A" used only once: possible typo at -e line 1.
Use of uninitialized value in hash dereference at -e line 1.
Argument "" isn't numeric in numeric eq (==) at -e line 1.
Use of uninitialized value in numeric eq (==) at -e line 1.
D:\>
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