Re^3: use of $sub

in reply to Re^2: use of $sub
in thread use of $sub

I would like to understand the addition of "$"

Not, "$" but "$!". The exclamation mark is not just for decoration. See perlvar.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

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Re^4: use of $sub by JimLS (Novice) on Oct 19, 2012 at 15:57 UTC
Not, "$" but "$!". No, I don't mean "$!". I looked up "$!" and understood that. I mean the addition of "$" to "SUB" resulting in "$SUB".	[reply]
Re^5: use of $sub by tobyink (Canon) on Oct 19, 2012 at 16:09 UTC
Oh OK. `$SUB` is just a variable... same idea as `$TUB` or `$PUB` or `$RUB`... nothing special. In this case it's undefined, so when interpolated into the string doesn't do anything. `perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'`	[reply] [d/l] [select]
Re^6: use of $sub by JimLS (Novice) on Oct 19, 2012 at 17:03 UTC
I could be way off base but I was thinking that $SUB (or SUB) was used in an attempt to report where in the program/which subroutine the error occured and was a predefined thing. If not, it must have been set in other parts of the program that this chunk of code may have been pulled out of. In any case I don't need it and will delete it. Thanks!	[reply]

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