sidef/scripts/Tests/function_composition.sf

#!/usr/bin/ruby

# https://rosettacode.org/wiki/Functional_Composition

func compose (f, g) {
    func(n){ f(g(n)) }
}

func f(n) {
    n / 64;
}

func g(n) {
    n * 32;
}

var fg = compose(f, g);    # fg(x) is equivalent with: f(g(x))

assert_eq(fg(4), 2);
say "** Test passed!";