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Re^2: Two arrays into hash

by davorg (Chancellor)
on Jul 16, 2009 at 10:40 UTC ( #780642=note: print w/replies, xml ) Need Help??

in reply to Re: Two arrays into hash
in thread Two arrays into hash

[@array] can be/usually is written as \@array

Careful. The two are not the same. \@array returns a reference to the existing array. [@array] creates a new (anonymous) copy of the original array and returns a reference to the copy. It's a subtle difference, but an important one.

#!/usr/bin/perl use strict; use warnings; my @arr = (1 .. 5); my %hash = ( aref => \@arr, copy => [ @arr ], ); print "@{$hash{copy}}\n"; print "@{$hash{aref}}\n"; @arr = ('a' .. 'e'); print "@{$hash{copy}}\n"; # original values print "@{$hash{aref}}\n"; # changed values

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Re^3: Two arrays into hash
by Bloodnok (Vicar) on Jul 16, 2009 at 10:43 UTC
    Good point, well made - I rather overlooked that didn't I ?

    Thanx davorg.

    A user level that continues to overstate my experience :-))

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