http://www.perlmonks.org?node_id=998051


in reply to Re^4: hash array
in thread hash array

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;

[download]
where $CODE is the expression (delimited by a comma) or block (no delimiter) in the first argument.

example: 

@output = map $_*2, 1 .. 10;

[download]
which is identical in result to 
@output = map { $_*2 } 1 .. 10;

[download]
and which return the even numbers from 2 to 20; the double of all numbers between 1 and 10.

In Section Seekers of Perl Wisdom