hash of arrays question

[John Gregory]

I'm new to perl and have a question. The perl book
says that hashes map keys to values. Using the reverse
function you can map values to keys. My problem is
I have a hash of arrays and I want to map an array
of values to a particular key. Is there any way to
do this?

Thanks,

John

 

[Skeleton Man]

I'm new to perl and have a question. The perl book

says that hashes map keys to values. Using the reverse
function you can map values to keys. My problem is
I have a hash of arrays and I want to map an array
of values to a particular key. Is there any way to
do this?

There are two ways to do this:

$sample{'key1'} = ['item1', 'item2', 'item3']; # Array of values mapped to a
single hash key (note the use of square brackets [])
print $sample{'key1'}[0]; # Prints "item1"

Or:

@data = ('item4, 'item5', 'item6', 'item7'); # Create a new array
$sample{'key2'} = \@data; # Take a reference to the
array (backslash operator), you could use any existing array here too.
print $sample{'key2'};


Let me know if you need anything explained a little more clearly

Regards,
Chris

 

[mzi]

I'm new to perl and have a question. The perl book
says that hashes map keys to values. Using the reverse
function you can map values to keys. My problem is
I have a hash of arrays and I want to map an array
of values to a particular key. Is there any way to
do this?

There are two ways to do this:

$sample{'key1'} = ['item1', 'item2', 'item3']; # Array of values mapped to
a single hash key (note the use of square brackets [])
print $sample{'key1'}[0]; # Prints "item1"

Or:

@data = ('item4, 'item5', 'item6', 'item7'); # Create a new array
$sample{'key2'} = \@data; # Take a reference to the
array (backslash operator), you could use any existing array here too.
print $sample{'key2'};


Let me know if you need anything explained a little more clearly

This means: hash values can be references.

 

[Michael Gaylord]

I'm new to perl and have a question. The perl book

says that hashes map keys to values. Using the reverse
function you can map values to keys.

AFAIK, the reverse function takes a list/array, and returns
it in the opposite order.

My problem is
I have a hash of arrays and I want to map an array
of values to a particular key. Is there any way to
do this?

Something like this?

@contents = (1,2,3,4,5)
$hashofarrays{key} = \@contents

I can then reference like follows:

print $hashofarrays{key}[2]

outputs: 3

 

[joesmith]

Joe

Hi

I tried this output but didn't print

$sample{key1} =(1,2,3,4,5);
print $sample{key1}[0]; - it doesn't print the output of 1.


any idea why ?