Question

In Perl, if you have a loop like this:

foreach (@items) {
    perform_action($_);
}

you can replace it with a call to map in void context:

map {
    perform_action($_)
} @items;

Are there any advantages or disadvantages to doing to? Does it have a performance impact because Perl thinks it has to save the results? Does it improve/worsen readability?

Answer 1

Starting from Perl 5.8.1 map in void context is not expensive:

map in void context is no longer
expensive. map is now context aware,
and will not construct a list if
called in void context.

But the postfix form of for may be more readable:

perform_action($_) for @items;