CSV spreadsheet files are suitable for storing tabular data in a relatively portable way.

The CSV format is flexible but somewhat ill-defined.

For present purposes, authors may assume that the data fields contain no commas, backslashes, or quotation marks.



Task

Read a CSV file, change some values and save the changes back to a file.

For this task we will use the following CSV file:

C1,C2,C3,C4,C5
1,5,9,13,17
2,6,10,14,18
3,7,11,15,19
4,8,12,16,20

Suggestions


 Show how to add a column, headed 'SUM', of the sums of the rows.
 If possible, illustrate the use of built-in or standard functions, methods, or libraries, that handle generic CSV files.



my $csvfile = './whatever.csv';
my $fh = open($csvfile, :r);
my @header = $fh.get.split(',');
my @csv = map {[.split(',')]>>.Num}, $fh.lines;
close $fh;
 
my $out = open($csvfile, :w);
$out.say((@header,'SUM').join(','));
$out.say((@$_, [+] @$_).join(',')) for @csv;
close $out;