Re^4: Golf: reverse sort /etc/passwd by UID

in reply to Re^3: Golf: reverse sort /etc/passwd by UID
in thread Golf: reverse sort /etc/passwd by UID

~~No, no. It does work (tested and confirmed). See my reply to thundergnat.~~

~~NOTE- remember you have to omit the typos though, as I already pointed out. So far, the winner remains:~~

UPDATE: thundergnat is right that the code below DOESN'T work as intended

perl -e 'print reverse sort{/(:\d+:)/<=>/(:\d+:)/}<>' /etc/passwd

Tommy
A mistake can be valuable or costly, depending on how faithfully you pursue correction

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Re^5: Golf: reverse sort /etc/passwd by UID by thundergnat (Deacon) on Feb 05, 2013 at 20:40 UTC
No, no. It doesn't work (tested and confirmed). The sort block operates on the global variables $a and $b. A match without an explicit variable operates on $_. There is nothing mapping $a and $b to $_ there, so the sort block is just comparing 0 to 0 and leaving the order alone. The fact that /etc/password is in a "sorted" order makes it SEEM like it is working... but it isn't. `print reverse sort{/(:\d+:)/<=>/(:\d+:)/}<DATA>; __DATA__ aaa:5: bbb:3: ccc:1: ddd:7: eee:8:` [download] eee:8: ddd:7: ccc:1: bbb:3: aaa:5:	[reply] [d/l]

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Re^5: Golf: reverse sort /etc/passwd by UID
by thundergnat (Deacon) on Feb 05, 2013 at 20:40 UTC

No, no. It doesn't work (tested and confirmed).

The sort block operates on the global variables $a and $b. A match without an explicit variable operates on $_. There is nothing mapping $a and $b to $_ there, so the sort block is just comparing 0 to 0 and leaving the order alone. The fact that /etc/password is in a "sorted" order makes it SEEM like it is working... but it isn't.

print reverse sort{/(:\d+:)/<=>/(:\d+:)/}<DATA>;

__DATA__

aaa:5:
bbb:3:
ccc:1:
ddd:7:
eee:8:
[download]

eee:8:
ddd:7:
ccc:1:
bbb:3:
aaa:5:

[reply]
[d/l]

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