on Sat, 13 Jul 2002 10:42:23 GMT, Connie Chan wrote:
> But what I most consider is that, if I use numeric format as hash
> key will cause any error. As long as other programming langs I
> learnt, I know var name should not in numeric format, but the
> grey zone for me in this case is that I can treat the key as string
> too... so maybe no problem... I don't know...
There is no problem whatsoever in using hash keys which are numbers.
The only thing to watch out for is the autoquoting feature of the '=>'
operator and between the '{}' hash delimiters, which only work if the
token on the left of '=>' or between '{}' has the form of a Perl
identifier.
E.g.
%hash = ( abc => 'xyz');
$hash{abc} = 'xyz;;
will work, but
%hash = (0123 => 'xyz');
$hash{0123} = 'xyz';
will not. However,
%hash = ('0123' => 'xyz');
$hash{'0123'} = 'xyz';
will always work.
--
felix
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