Re^3: Having trouble reading in a hash from a referenced array

> Why is it even allowed to work?

It's the same and documented so, after the first arrow the others are redundant

$VAR1->{"movie_results"}->[0]

exactly the same as

$VAR1->{"movie_results"}[0]

will update with links to perldocs ...

UPDATE

see perlreftut#Arrow-Rule

"In between two subscripts, the arrow is optional."

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

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Re^4: Having trouble reading in a hash from a referenced array by bliako (Abbot) on Dec 18, 2020 at 23:24 UTC
Quite right you are. But I feel that making the arrow optional between two subscripts is confusing if Perl still makes a distinction between a reference and the data structure it refers to. I guess the rule is simple: PDS (Perl Data Structure=hash,array) can not contain arrays but refs or scalars. So drop the arrow notation. Hmmmm that might be confusing for a new-comer as it may suggest that arrays (not arrayref) is allowed inside a PDS. That's a general Perl comment, not about what you wrote.	[reply]
Re^5: Having trouble reading in a hash from a referenced array by jo37 (Curate) on Dec 19, 2020 at 14:09 UTC
Maybe the intention is to allow `$a[1][2][3]` instead of the clumsy `$a[1]->[2]->[3]`. Greetings, -jo `$gryYup$d0ylprbpriprrYpkJl2xyl~rzg??P~5lp2hyl0p$`	[reply] [d/l] [select]
Re^5: Having trouble reading in a hash from a referenced array by LanX (Saint) on Dec 19, 2020 at 01:04 UTC
I think of an `@array` as just syntactic sugar for an `$a_ref = \@array.` They are not two different data types, just two sides of the same coin. Without `@sigil` and `%sigil` many context mechanics wouldn't work. Edit Concerning repeated arrows ... Perl is very special among other scripting languages in requiring explicit dereferencing. (this might be a C thing, I'm not sure) How would you explain to someone coming from JS, Python or Ruby that he not only needs one -> but a bunch full for every level? Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]
Re^6: Having trouble reading in a hash from a referenced array by LanX (Saint) on Dec 19, 2020 at 01:41 UTC
> They are not two different data types, OK, before someone starts complaining: Yes Perl has an internal type for scalars holding references, so $a_ref would be of that type. But that's not what I meant. Every @array has already a ref-address for the internal memory location, even before you try assigning it explicitly to a $scalar `DB<8> use Devel::Peek DB<9> @x=(1) DB<10> Dump @x SV = PVAV(0x31c26e0) at 0x31dbe08 <---- REFCNT = 1 FLAGS = () ARRAY = 0x31ff138 FILL = 0 MAX = 3 ARYLEN = 0x0 FLAGS = (REAL) Elt No. 0 SV = IV(0x31dba20) at 0x31dba30 REFCNT = 1 FLAGS = (IOK,pIOK) IV = 1 DB<11> p \@x ARRAY(0x31dbe08) <---- DB<12>` [download] Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l]

UPDATE

Edit