Re: keys and values

Please read perldata.

Contents of CSV sheet1, stored in hash table.
$VAR1 = 'key_2'; $VAR2 = 'value_2'; $VAR3 = 'key_1'; $VAR4 = 'value_1';
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This is not a hash table. This is a series of assignments of values to four independent variables. At most, this looks like an array broken up into pieces, which should be written as

@VAR = ('key_2', 'value_2', 'key_1', 'value_1');
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In a perl hash table, values are associated to keys, and the values can be retrieved with the keys.

%VAR = ( key_1 => 'value_1', key_2 => 'value_2');
print "value for key 2: '$VAR{key_2}'\n";
__END__
value for key 2: 'value_2'
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Please read perldata. Done that (and trying what's stated there) you will be able to find out how to print values corresponding to keys.

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

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Re^2: keys and values by Anonymous Monk on Sep 22, 2014 at 23:05 UTC
This is not a hash table. This is a series of assignments of values to four independent variables. At most, this looks like an array broken up into pieces ... It's most likely this: `use Data::Dumper; my %hash = ( key_1 => 'value_1', key_2 => 'value_2' ); print Dumper(%hash); __END__ $VAR1 = 'key_2'; $VAR2 = 'value_2'; $VAR3 = 'key_1'; $VAR4 = 'value_1';` [download] Better would have been `print Dumper(\%hash);`	[reply] [d/l] [select]

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Re^2: keys and values
by Anonymous Monk on Sep 22, 2014 at 23:05 UTC

This is not a hash table. This is a series of assignments of values to four independent variables. At most, this looks like an array broken up into pieces ...

It's most likely this:

use Data::Dumper;
my %hash = ( key_1 => 'value_1', key_2 => 'value_2' );
print Dumper(%hash);

__END__
$VAR1 = 'key_2';
$VAR2 = 'value_2';
$VAR3 = 'key_1';
$VAR4 = 'value_1';
[download]

Better would have been print Dumper(\%hash);

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