Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

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

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1026569]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (6)
As of 2019-11-21 23:50 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Strict and warnings: which comes first?



    Results (107 votes). Check out past polls.

    Notices?