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

I would like to evaluate an expression where the values of the variables in the expression are taken from a hash. I can't figure out how. Can anyone help?

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Re: eval using hash values
by robartes (Priest) on Nov 05, 2002 at 15:05 UTC
    What exactly do you want to do? Is something like this what you are looking for? 
    use strict;
my %hash=qw/camel desert dolphin water/;
eval("print qq{A camel lives in the $hash{'camel'}, as opposed to a do
+lphin, who lives in the $hash{'dolphin'}\n};");

    [download]

    CU
    Robartes-

[reply]
[d/l]
Re: eval using hash values
by swiftone (Curate) on Nov 05, 2002 at 15:18 UTC
    It may be a bit of an overkill, but assuming you are trying to have: 
    $text = 'my $foo has gone completely $bar';
%hash = (foo => 'dog',  bar => 'crazy');
$final_text = unknown_method($text);
#$final_text is now 'my dog has gone completely crazy'

    [download]
    I think Text::Template will do exactly what you want. If that's not what you want, please clarify.
[reply]
[d/l]

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