map is a looping function to apply an expression or a block to every item in a list (each item in turn assigned to $_), and collect/return the list of results. It's like:
my @results;
foreach(@_) {
push @results, &$CODE();
}
return @results;
where $CODE is the expression (delimited by a comma) or block (no delimiter) in the first argument.
example:
@output = map $_*2, 1 .. 10;
which is identical in result to
@output = map { $_*2 } 1 .. 10;
and which return the even numbers from 2 to 20; the double of all numbers between 1 and 10.
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