Re^4: specific array in hash of arrays

if (exists $hoh{$array_name}->{$to_find}) {
[download]

should normally be

if (  exists( $hoh{$array_name} )
   && exists( $hoh{$array_name}->{$to_find} )
) {
[download]

to prevent autovivification of entries into %hoh. That might not matter here, though.

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Re^5: specific array in hash of arrays by gone2015 (Deacon) on Oct 09, 2008 at 15:01 UTC
Rats... "autovivication" :-( Just when I thought I was getting to grips with Perl magic, another piece bites me in the backside... "autovivifying" an rvalue ? ...of course, silly me !	[reply]
Re^6: specific array in hash of arrays by ikegami (Patriarch) on Oct 09, 2008 at 15:21 UTC
lvalue or rvalue doesn't matter. Treating an undefined variable as a reference will instantiate the referree and store a reference in the variable. Note that it's `->` performing the autovivification, not `exists`.	[reply] [d/l] [select]