Good practice to detect empty string?

ipellew_at_pipemedia.co.uk
Date: 12/21/04 

Date: 20 Dec 2004 16:04:34 -0800

Hi all;

Pls advise the perlophiliacs method of deciding a string is empty.

I am using
if ( $@ || $c_var eq "" ) {
but constantly read `eq` is expensive.

For example is
if ( $@ || ! length $c_var ) {
better, faster, cheaper

Regards
Ian

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