Some changes that I make in a mdn snippet to see it work

Was this way:

Let myFunc;

if (num ===0); {

    myFunc = function (theObject) {

        theObject.make = 'Toyota';

    }

}

To this:

        let myFunc21;

        num =0;//1st line added, to initialize the num

       

        if(num ===0) {

           

            myFunc21 = function (theObject) {

                return theObject.make = 'Toyota';// Was added the return

            }

        }

       

        let mi = {make:'bn'};//creating an variable to test the function

        const t = myFunc21(mi);//creating another variable to keep the function result

And after I would put an way to print that but also you could go to the console and write directly t

and will answer 'Toyota', or ad in your code an alert, a prompt a document.write. Rute Bezerra de Menezes Gondim