I'm an engineer working on Hack. I'm pretty sure we have a bug in our completion detection logic for this exercise in the tutorial. Your code looks correct to me -- changing the return type to this
is, as far as I can see, all you were supposed to do. I'll follow up and get this bug fixed. Sorry about that!
Hacklang tutorial - this type in extend class [closed]
Frage
What is correct answer for hack tutorial exercice 16?
Link to tutorial: Hacklang tutorial
My modified code (not marked as solution):
<?hh
// The type 'this' always points to the most derived type
class MyBaseClass {
protected int $count = 0;
public function add1(): this {
$this->count += 1;
return $this;
}
}
class MyDerivedClass extends MyBaseClass {
public function print_count(): void { echo $this->count; }
}
function test(): void {
$x = new MyDerivedClass();
$x->add1()->print_count();
}
I replaced MyBaseClass
by this
but still not marked as correct (green text with Exercice number) .. what is correct answer?
Lösung
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