Problem with Multi-Level inheritance

[espruino-discuss]

Posted at 2023-02-26 by llakie

class A {
  constructor() {}
}

class B extends A {
  constructor() {
    super();
  }
}

class C extends B {
  constructor() {
    super();
  }
}

function onInit() {
  const c = new C();
}

Hi, I have a problem, which could be boiled down to the code snippet given above.
If I run it on my Espruino WiFi (2v16), I get a recursion error, since if class B tries to call the constructor of A, it calls its own constructor.
Does anyone has a workaround for this problem? I already tried passing different argument lists into the constructors to make them distinguishable (in C++ mapping terms at least). Without any luck. I can easily instantiate B or A, but not C.
I would really appreaciate your help. Thank you very much.

[espruino-discuss]

Posted at 2023-02-26 by llakie

This does work, but I really would like to use class notation.

var A = function() {};

var B = function() {
  A.call(this);
};
B.prototype = Object.create(A.prototype);
B.prototype.constructor = B;

var C = function() {
  B.call(this);
};

C.prototype = Object.create(B.prototype);
C.prototype.constructor = C;

function onInit() {
  const c = new C();
}

[gfwilliams]

Posted at 2023-02-27 by @gfwilliams

This was actually fixed just last week! espruino/Espruino@435b4da

If you install a 'cutting edge' build it will hopefully be fixed!

[espruino-discuss]

Posted at 2023-02-27 by llakie

Works like a charm. Thanks Gordon. What a coincidence ;)

[gfwilliams]

Posted at 2023-02-28 by @gfwilliams

:) Yes! It's odd - someone else picked up on it last week which is why I fixed it, but otherwise the bug report itself is over 4 years old!