Hash Table Question 1

[javalsu]

Last time I posted you guys were really helpful, so here I go again.

What does it mean when a hash table seems to have two key elements.

for example

my %htable

htable{"n", "g"} = 100

Thanks in advance

 

[ishnid]

You haven't posted valid code there.

The usual reason for referencing multiple keys of a hash is to set them at the same time, using a "hash slice". e.g.:

@htable{'n', 'g'} = (100,200);

So now the value of $htable{n} is 100 and $htable{g} is 200.

 

[MikeLacey]

Hi javalsu

Your code (which I think should look like this)

my %htable;

$htable{"n", "g"} = 100;

It's an old fashioned, but still valid, way of treating a hash as if it is multidensional.

You could use this method to store values for all of the squares in a crossword puzzle for instance.

$row=1;
$col=1; $xwordgrid{$row,$col}='T';
$col=2; $xwordgrid{$row,$col}='E';
$col=3; $xwordgrid{$row,$col}='K';
$col=4; $xwordgrid{$row,$col}='T';
$col=5; $xwordgrid{$row,$col}='I';
$col=6; $xwordgrid{$row,$col}='P';
$col=7; $xwordgrid{$row,$col}='S';

You could then print out the crossword grid using a couple of loops.

It's more usual now to use nested hashes and things, but they're a bit clever for me.

Mike

The options are: fast, cheap and right - pick any two. &

Want great answers to your Tek-Tips questions? Have a look at faq219-2884

 

[javalsu]

Thanks, after looking at it looks like it is a multidimensional hash table.

Now I just have to implement a multidimensional hashtable in vb.net