Method demo

examples/demo.php:2303–2327

()

class FirstClassCallableDemo
{
    public function demo(): void
    {
        $src = new ScaffoldingFirstClassCallable();

        $fun = makePen(...);
        $fun()->write();                   // function reference → Closure returning Pen

        $orderFn = $src->dispatch(...);
        $orderFn()->write();              // instance method → Closure returning Pen

        $finder = Pen::make(...);
        $finder()->color();               // static method → Closure returning Pen

        $make = makePen(...);
        $pen = $make();
        $pen->color();                    // assigned result from callable invocation

        // Immediate invocation: method(...)() returns the method's return type
        makePen(...)()->write();          // function first-class callable invoked immediately
        Pen::make(...)()->color();        // static method first-class callable invoked immediately
        $src->dispatch(...)()->write();   // instance method first-class callable invoked immediately

        $immediate = Pen::make(...)();
        $immediate->color();              // assigned result from immediate static callable invocation
    }
}