examples/function_first_class.av

## examples/function_first_class.av

fn square(x) {
  return x * 2;
}

let add = lambda(x, y, f) ->
  f(x) + f(y)
end;

let add_n = lambda(x) ->
  lambda(y) -> 
    x + y
  end
end;

println(type(square));
println(type(add));
println(type(add_n));

let s = add(1, 2, square);
println(s);

let add_3 = add_n(3);
println(type(add_3));
println(add_3(1));
println(add_3(99));
println(add_3(' test'));