Further to Anonymonk's point: 

>perl -wMstrict -le
"use Data::Dump;
 ;;
 my $sheet = { qw(F29 foo  G30 bar) };
 dd $sheet;
 ;;
 my %sheet;
 ;;
 print qq{'$sheet->{F29}'};
 print qq{'$sheet{G30}'};
"
{ F29 => "foo", G30 => "bar" }

'foo'
Use of uninitialized value $sheet{"G30"} in concatenation (.) or strin
+g at -e line 1.
''

[download]

Do you see how the expressions  $sheet->{F29} and  $sheet{G30} access two completely different structures, one of which is empty?

... I can make no sense of the order in which it displays contents.

A hash has no internal "order" except for the pairing of each unique key with its value. Access to and listing of hash keys, values and key/value pairs is (apparently) random. (Update: Don't be mislead by the fact that the order in the dump displayed above matches the order of initialization of the hash reference example: this is entirely adventitious. The dump of a larger hash structure will show greater disorder — but again, a key always cleaves to its value.)

In reply to Re^10: Iterating Through Cell Blocks with Spreadsheet::Read by AnomalousMonk
in thread Iterating Through Cell Blocks with Spreadsheet::Read by Hammer2001

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