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Postings from February 2010
At 5:48 AM -0500 2/6/10, Chris Coggins wrote:
>1. another script uses data passed into it from an html form. Some
>of the fields are empty, and my "print report file" subroutine
>prints the empty variables because I don't know how to filter them
>out, and they need to be removed from the report. Can someone give
>me the perfectly formed "if" statement that lets me skip over the
>one or two empty variables during the print action? The data being
>printed to the file is stored in an array. See code below.
>
>print FILE ("Report summary: $taskarray[0] \n"); #this value is good
>print FILE ("Data for task 3: $taskarray[3] \n"); #this value is good
>print FILE ("Data for task 7: $taskarray[7] \n"); #this value is
>empty, don't print this data
>print FILE ("Data for task 2: $taskarray[2] \n"); #this value is
>empty, don't print this data
>print FILE ("Data for task 11: $taskarray[11] \n"); #this value is
>good but needs to be modified, see #2 below
If a scalar variable is empty, i.e. is either undef or an empty
string '', it will have a false value in a logical expression.
Therefore, you can test the value of the variable and only print it
if it is true:
if( $string ) {
print "$string\n";
}
or the shorter equivalent:
print "$string\n" if $string;
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