David Draley wrote:
> I am trying to make a hash slice that only includes the keys "SHELL" and
> "DB" for %unix - using a reference. How do I reference specific elements in
> a % table? thanks
Hash slice is a list of values (for given keys).
This two lines does the same:
@slice = @unix{SHELL,DB};
@slice = ($unix{SHELL}, $unix{DB});
@slice array now contains two elements: "/bin/csh" and "mysql".
But as far as I understood, you don't want a slice, but a second hash
which will have only part of key/value pairs from the first one. Hash
slice is an l-value, so you can assign one hash slice to another:
@unix2{SHELL,DB} = @unix{SHELL,DB};
that way, %unix2 hash will have SHELL and DB values (and only those) the
same as %unix hash. You can also store keys in array:
@keys = qw(SHELL DB PAGER);
@unix3{@keys} = @unix{@keys};
Is that what you need? In Perl 5 the funny character ($, @, %) means
what the expression evaluates to. Hash slice is a list, so it starts
with @ sign. However in Perl 6 this will change.
- RaFaL Pocztarski, [EMAIL PROTECTED]
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