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about array in array

makals
Novice

Jan 7, 2011, 9:13 PM

Post #1 of 3 (762 views)

about array in array	Can't Post

hello

see this:

$ref = [ 1, 2, [ 10, 20 ] ];
$element = {$ref->[2]}->[1];

what is it mean the [2] and [1] ?

(This post was edited by makals on Jan 7, 2011, 9:19 PM)

BillKSmith
Veteran

Jan 8, 2011, 7:50 AM

Post #2 of 3 (744 views)

Re: [makals] about array in array [In reply to]	Can't Post

Your first statement creates an anonymous array consisting of three elements ( '1', '2', and a reference to another array which contains two elements '10' and '20'). A reference to this array is assigned to the scalar $ref.

Your second statement accesses the '20':

$ref->[2] accesses the third element of the array referenced by $ref. This element is a reference.

{...}->[1] accesses the second element of the array referenced by that reference.

Note: the 1 and 2 are array indexes (which start at zero).

Refer: perldoc perlref
Good Luck,
Bill

shawnhcorey
Enthusiast

Jan 8, 2011, 8:40 AM

Post #3 of 3 (741 views)

Re: [makals] about array in array [In reply to]	Can't Post

In Reply To

hello

see this:

$ref = [ 1, 2, [ 10, 20 ] ];
$element = {$ref->[2]}->[1];

what is it mean the [2] and [1] ?

It means nothing.

Code

perl -e'$ref = [ 1, 2, [ 10, 20 ] ]; 
> $element = {$ref->[2]}->[1]; ' 
Not an ARRAY reference at -e line 2.

Perhaps you meant

Code

perl -e'$ref = [ 1, 2, [ 10, 20 ] ]; 
> $element = $ref->[2]->[1]; '

Though it is commonly written as

Code

perl -e'$ref = [ 1, 2, [ 10, 20 ] ]; 
> $element = $ref->[2][1]; '

__END__

I love Perl; it's the only language where you can bless your thingy.

Perl documentation is available at perldoc.perl.org. The list of standard modules and pragmatics is available in perlmodlib.

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