[flatwhatson]

Here's one more efficient way... use perl!

  #!/usr/bin/perl
  
  use Modern::Perl;
  use List::Util 'reduce';
  
  sub cook {
    my ($i1, $i2, $f) = @_;
    say "get the $i1";
    $f->($i1);
    $f->($i2);
  }
  
  cook "lobster", "water",   sub { say "pot "  . shift };
  cook "chicken", "coconut", sub { say "boom " . shift };
  
  my @a = (1, 2, 3);
  
  map { say $_ * 2 } @a;
  map { say $_     } @a;
  
  sub my_sum {
    reduce { $a + $b } 0, @_;
  }
  
  sub my_join {
    reduce { $a . $b } "", @_;
  }
  
  say "sum "  . my_sum(@a);
  say "join " . my_join(@a);