Problem Statement

Partial function application   is the ability to take a function of many parameters and apply arguments to some of the parameters to create a new function that needs only the application of the remaining arguments to produce the equivalent of applying all arguments to the original function. E.g:

Note that in the partial application of a parameter, (in the above case param1), other parameters are not explicitly mentioned. This is a recurring feature of partial function application.

Let's start with the solution:

sub fs ( Code $f, @s ) { @s.map: { .$f } }
 
sub f1 ( $n ) { $n *  2 }
sub f2 ( $n ) { $n ** 2 }
 
my &fsf1 := &fs.assuming(&f1);
my &fsf2 := &fs.assuming(&f2);
 
for [1..3], [2, 4 ... 8] X &fsf1, &fsf2 -> ($s, $f) {
    say $f.($s);
}