Re^2: Why am I getting Can't use string (<string value>) as an ARRAY ref wile "strict refs" in use

There's also multidimensional hashes:

perl -E'my %x; $x{1,2,3} = 4; print $x{1,2,3}, "\n";'
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They're kinda weirdly implemented and not really used much.

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Re^3: Why am I getting Can't use string (<string value>) as an ARRAY ref wile "strict refs" in use by afoken (Chancellor) on Mar 01, 2019 at 13:20 UTC
There's also multidimensional hashes [...] They're kinda weirdly implemented and not really used much. Basically, all list elements are joined by $; (defaults to \034 = \x1C = ASCII FS) before using them as hash key. This is not multidimensional, it is just a poor emulation used mainly for awk compatibility. Problems: The list elements must not contain the value of `$;` or else your data becomes garbage. Of course, you should not modify `$;` at runtime or else your data becomes garbage again. keys and each return the joined keys, not lists of key parts. There is no automatic split. The syntax does not work for slices. Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply] [d/l] [select]
Re^3: Why am I getting Can't use string (<string value>) as an ARRAY ref wile "strict refs" in use by Lotus1 (Vicar) on Feb 28, 2019 at 21:48 UTC
I found a description of this at Multi dimensional array emulation. It looks like it is creating a hash key from the list, "1,2,3". This seems like it could be a good way to implement a sparse array. `use warnings; use strict; use Data::Dumper; my %x; $x{1,2,3} = 4; print $x{1,2,3}, "\n"; print Dumper(\%x); __DATA__ 4 $VAR1 = { '1‡˜2‡˜3' => 4 };` [download]	[reply] [d/l]