What does Function.prototype.toMethod() do?

Question

I noticed that the Function.prototype has a toMethod() method in experimental JavaScript, but what does that actually do? And how do I use it?

Answer 1

My understanding is that .toMethod is like cloning a function. Consider the example in the source I posted,

class P { }
class C extends P {
    foo() {
        console.log("f");
        super();
    }
}
P.prototype.foo=C.prototype.foo;
(new C).foo();

Here you reference a subclass method .foo in the superclass, so when you call .foo, it will reference P's .foo which is C's .foo and you have just created a loop.

It seems like to solve this issue, you can use .toMethod which "clones" the function and give it a different super/"home" that you specifed:

P.prototype.foo = C.prototype.foo.toMethod(P.prototype);

now calling (new C).foo() would not go on forever.