* [EMAIL PROTECTED] ([EMAIL PROTECTED]) wrote:
> >>
> > # foreach $number (qw <en tre ni>) {
> > foreach $number ($extract) {
> > push (@return_array, $hash_table{$number});
> > }
> > return @return_array;
>
> return @hash_table{ @extract };
>
> >>>>This will return a list of values from %hash_table using the keys from
> >>>>@extract.
>
> Please explain why this works. thank you.
It's called a hash slice because it gives you a 'slice' of the hash
you're working with. First I'll define a hash for the example:
my %hash = (
name => 'Jeff Bisbee',
occupation => 'Perl Programmer',
email => '[EMAIL PROTECTED]',
);
You access a slice of that hash by providing an array of keys and the
hash slice will return an array of values.
my @key_array = qw(name email);
my ($name, $email) = @hash{ @key_array };
Or just write it all in one line...
my ($name, $email) = @hash{ qw(name email) };
Hash slices provide a powerful way to quickly get at values of
a hash when you provide an array of keys.
Remember when you deal with hash slices you need to address the
hash with an '@'. This notation is what tripped me up when I
first started working with them.
-biz-
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
