如何从 javascript 中的方法引用中检索 class？

Question

I would like to do this:

function call(method) {
    const object = // Retrieve the class that declares the method and then construct an instance dynamically.
    method.call(object) // So 'this' is bound to the instance.
}

call(MyClass.prototype.myMethod)
call(AnOtherClass.prototype.anOtherMethod)

My goal is to create the instance from a dependency container. That's why the method has to be bound to an instance that will have all the dependencies required by the class.

Answer 1

You can't do this automatically without some restructuring. If it were me, I'd pass the class as an argument:

function call(theClass, method) {
  const instance = new theClass();
  method.call(instance);
}

call(MyClass, MyClass.prototype.myMethod)
call(AnOtherClass, AnOtherClass.prototype.anOtherMethod)

or, you could pass just the prototype method names for the second argument:

function call(theClass, method) {
  const instance = new theClass();
  instance[method]();
}

call(MyClass, 'myMethod')
call(AnOtherClass, 'anOtherMethod')