Re: passing arrays

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Re^2: passing arrays by GrandFather (Saint) on Apr 19, 2008 at 19:35 UTC
Actually all three arguments to split [pattern[, expression[, limit]]] are optional. Pattern defaults to whitespace splitting (' '). Expression defaults to $_. Limit defaults to 0 - that is, no limit. Perl is environmentally friendly - it saves trees	[reply]
Re^3: passing arrays by Not_a_Number (Prior) on Apr 19, 2008 at 21:00 UTC
Actually all three arguments to split [pattern;[, expression, limit]] are optional. I find that statement misleading. See the 'template' at the top of spilt: `split /PATTERN/,EXPR,LIMIT split /PATTERN/,EXPR split /PATTERN/ split` [download] This implicitly (and rightly) excludes: `split EXPR` Which is exactly what the OP tries to do in the line: `@mails = split ('$line');` This is why the OP's code generates the following error: `Use of uninitialized value $_ in split at XX.pl line YY.` IOW, the 'expression' argument is optional only if the 'pattern' argument is present.	[reply] [d/l] [select]
Re^4: passing arrays by Fletch (Bishop) on Apr 20, 2008 at 04:07 UTC
In that case the expression to be split is defaulting to `$_`, but at the time of his call it contains `undef`. You don't have to explicitly provide the text to split, but if you don't do so you should have what you want to split in `$_` or it's not going to be very useful. The cake is a lie. The cake is a lie. The cake is a lie.	[reply] [d/l] [select]
Re^3: passing arrays by ikegami (Patriarch) on Apr 19, 2008 at 19:50 UTC
-1 is no limit. 0 is no limit and discard empty trailing fields.	[reply]
Re^4: passing arrays by GrandFather (Saint) on Apr 19, 2008 at 19:56 UTC
Bah, so much for the 'Perl Pocket Reference' (where I 'checked' the parameters). ;) Actually, although I don't use it much now, the 'Perl Pocket Reference' is a really handy little book. It has exactly the right amount of information in it for a quick reference and is well indexed. Highly recommended for Perl newbies (ikegami is not a Perl newbie btw)! Perl is environmentally friendly - it saves trees	[reply]
Re^5: passing arrays by ScOut3R (Sexton) on Apr 20, 2008 at 12:05 UTC
Re^2: passing arrays by ScOut3R (Sexton) on Apr 19, 2008 at 18:00 UTC
My bad. I wanted to write `split (' ', $line);`.	[reply] [d/l]