How can you both throw an Error and return a value from a Javascript function

Question

What is the cleanest way to both throw an error and return a value from a Javascript function?

Here's one proposed approach as a starting point:

(e, v) => {
   setTimeout(() => { throw(e) }, 0);
   return v; 
}

Here's a runnable snippet to demonstrate further:

var val = ((e, v) => {
   setTimeout(() => { throw(e) }, 0); // will throw in console
   return v; 
})('errMSG', 1)


alert(val); // 1 

Answer 1

Return an object that contains the value you are interested in, and an error:

return {
    value: "foo",
    error: new Error("bar")
}

The receiver can then throw the error as necessary