The $#array notation is handy when you don't know how big an array is. It is the last index in the array. 

    my $float = $_->[1] ?
        join( ',', @{$_}[1..$#$_]) : 'n/a';

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You may want those indexes to run through 0..$#$_.

After Compline,
Zaxo

In reply to Re: A confusing Use of uninitialized value by Zaxo
in thread A confusing Use of uninitialized value by Anonymous Monk

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