Apply a callback to an array: Difference between revisions

# create array

my @a = (1, 2, 3, 4, 5);

# create callback function

sub mycallback {

return 2 * shift;

}

# use array indexing

my $i;

print "mycallback($a[$i]) = ", mycallback($a[$i]), "\n";

}

# using foreach

foreach my $x (@a) {

print "mycallback($x) = ", mycallback($x), "\n";

}

# using map (useful for transforming an array)

my @b = map mycallback($_), @a; # @b is now (2, 4, 6, 8, 10)

# and the same using an anonymous function

my @c = map { $_ * 2 } @a; # @c is now (2, 4, 6, 8, 10)

# use a callback stored in a variable

my $func = \&mycallback;