For example, can I write some function (call it convert) that can convert an arrow function to a normal function? I want to bind the function to some object but I can’t do that for arrow functions. For example:

function test1() { console.log(this.a); }
const test2 = () => { console.log(this.a); }

const obj = { a: 4 };

function foo(f) {
    (f.bind(obj))();
}

foo(test1); //outputs 4 because `this` is `obj`
foo(test2); //outputs undefined because `this` is the window

I would like to write a function convert such that foo(test2) also outputs 4.

I initially tried something like

function convert(f) {
    return function() { f(); }
}

but that didn’t seem to work.