Skipping parameters in sprintf %, elegantly

brycen has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Skipping parameters in sprintf %, elegantly by ambrus (Abbot) on Aug 19, 2008 at 19:11 UTC
But to make your code self-documenting, the best practice might actually be `my($package, $file, $line) = caller(); sprintf "file=%s line=%s param=%d\n", $file, $line, $param;` [download]	[reply] [d/l]
Re: Skipping parameters in sprintf %, elegantly by kyle (Abbot) on Aug 19, 2008 at 18:30 UTC
`printf "file=%s line=%s param=%d\n", (caller())[1,2], $param;` [download]	[reply] [d/l]
Re: Skipping parameters in sprintf %, elegantly by ambrus (Abbot) on Aug 19, 2008 at 18:56 UTC
Yes, `"%.0s"`	[reply] [d/l]
Re^2: Skipping parameters in sprintf %, elegantly by brycen (Monk) on Aug 24, 2008 at 04:40 UTC
Perfect! Thanks.	[reply]
Re: Skipping parameters in sprintf %, elegantly by psini (Deacon) on Aug 19, 2008 at 19:00 UTC
In sprintf you can specify for each command the position in the list from which the value must be taken. I think this is a feature present from v.5.8, not sure... In your example you can do: `printf "file=%2\$s line=%3\$s param=%4\$d\n",caller(),$param;` to skip the first parameter. Rule One: "Do not act incautiously when confronting a little bald wrinkly smiling man."	[reply] [d/l]
Re: Skipping parameters in sprintf %, elegantly by gone2015 (Deacon) on Aug 19, 2008 at 18:44 UTC
Array slicing, eg: `printf "l=%s p=%s f=%s", (caller)[2, 0, 1] ;` [download]	[reply] [d/l]
Re^2: Skipping parameters in sprintf %, elegantly by jwkrahn (Abbot) on Aug 19, 2008 at 23:08 UTC
`(caller)[2, 0, 1]` is a LIST SLICE not an array slice, there is no array there.	[reply] [d/l]
Re^3: Skipping parameters in sprintf %, elegantly by gone2015 (Deacon) on Aug 19, 2008 at 23:51 UTC
I regret that the distinction between an ARRAY and a LIST in Perl is lost on me :-(. I humbly beg that you initiate me into this mystery.	[reply]
Re^4: Skipping parameters in sprintf %, elegantly by kyle (Abbot) on Aug 20, 2008 at 03:05 UTC
Re^5: Skipping parameters in sprintf %, elegantly by gone2015 (Deacon) on Aug 21, 2008 at 09:35 UTC
Re^5: Skipping parameters in sprintf %, elegantly ("list") by tye (Sage) on Aug 24, 2008 at 22:15 UTC
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Re^4: Skipping parameters in sprintf %, elegantly by bart (Canon) on Aug 20, 2008 at 09:00 UTC
Re: Skipping parameters in sprintf %, elegantly by ambrus (Abbot) on Aug 19, 2008 at 19:02 UTC
Alternately `"file=%2\$s line=%3\$s param=%4\$d\n"`. Note that the indexing starts by 1. Update: fixed typo in code where one of the `\$` was `\%` instead.	[reply] [d/l] [select]


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