OOP - 如何在Reason内部调用类方法

Question

I have a testFactory class. The purpose is to be able to pass in a factory, and then console out results for demoing purposes. As of now, when trying to call createProductA within the test method , the compiler will complain that createProductA is unbound ( Unbound value createProductA ).

What is the proper syntax for calling a method internally in a class?

class testFactory (factory: abstractFactory) => {
  as _;
  pub createProductA => factory#createProductA;
  pub createProductB => factory#createProductB;

  pub test () => {
    Js.log createProductA;
    Js.log createProductB;
  }
};

Answer 1

This is where the as _; part of the class definition comes in, if you've ever wondered what that was for.

createProductA and createProductB are methods, not functions, so they need to be called on an object. Reason/OCaml won't automatically bind the current object to a name like this or self , but puts it on you to do it, which is precisely what as does, and _ means, as usual, "I don't care about this". So if you change as _; to eg as self; you'll be able to reference self as the current object elsewhere.

Try this:

class testFactory (factory: abstractFactory) => {
  as self;
  pub createProductA => factory#createProductA;
  pub createProductB => factory#createProductB;

  pub test () => {
    Js.log self#createProductA;
    Js.log self#createProductB;
  }
};