First-class functions

Here we use the Z ("zipwith") metaoperator to zip the 𝐴 and 𝐵 lists with a user-defined compose function, expressed as an infix operator, ∘. The .() construct invokes the function contained in the $_ (current topic) variable.

sub infix:<∘> (&𝑔, &𝑓) { -> \x { 𝑔 𝑓 x } }

my \𝐴 = &sin,  &cos,  { $_ ** <3/1> }
my \𝐵 = &asin, &acos, { $_ ** <1/3> }

say .(.5) for 𝐴 Z∘ 𝐵

Output:

0.5
0.5
0.5

Operators, both buildin and user-defined, are first class too.

my @a = 1,2,3;
my @op = &infix:<+>, &infix:<->, &infix:<*>;
for flat @a Z @op -> $v, &op { say 42.&op($v) }

Output:

43
40
126