Re: null values

This has to be one of the most common initial questions that comes up about perl.

if ( defined( $q->param( "myinput" ) ) ) {
    print( $q->param( "myinput" ) );
}
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my $value = $q->param( "myinput" );
print( $value ) if ( $value );
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The above only works if $value is never going to be zero, because zero evaluates to false. A value of undef or zero is false. The following is safer:

my $value = $q->param( "myinput" );
print( $value ) if ( defined( $value ) );
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Re^2: null values by fluffyvoidwarrior (Monk) on May 26, 2005 at 08:15 UTC
Thanks People	[reply]

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