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Re: Trouble accessing Hash of Arrays (troubleshooting basics)

by Anonymous Monk
on Apr 02, 2013 at 02:36 UTC ( #1026569=note: print w/replies, xml ) Need Help??

in reply to Trouble accessing Hash of Arrays

Basic debugging checklist says  use strict; use warnings; especially if you want to cut your development time in half!

It will point you at problems with your code, like this

#!/usr/bin/perl -- use diagnostics; use strict; use warnings; use Data::Dump; my %sampleHash = (); my @array1 = ('a','b','c'); my @array2 = ("x","y","z","s"); $sampleHash{"hash1"} = @array1; $sampleHash{"hash2"} = @array2; dd \%sampleHash; print $sampleHash{"hash1"}[0]; __END__ $ perl fudge { hash1 => 3, hash2 => 4 } Can't use string ("3") as an ARRAY ref while "strict refs" in use at f +udge line 14 (#1) (F) Only hard references are allowed by "strict refs". Symbolic references are disallowed. See perlref. Uncaught exception from user code: Can't use string ("3") as an ARRAY ref while "strict refs" in +use at fudge line 14.

@array in scalar context returns its size , perlintro, Tutorials: Context tutorial

To store an array in a scalar, to store an array in a hash, you have to use the reference operator, reference-of operator, see perlreftut#Making References , references quick reference

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