// direct equivalent of PersonClass
let PersonType2 = (function() {

    "use strict";

    const PersonType2 = function(name) {

        // make sure the function was called with new
        if (typeof new.target === "undefined") {
            throw new Error("Constructor must be called with new.");
        }

        this.name = name;
    }

    Object.defineProperty(PersonType2.prototype, "sayName", {
        value: function() {

            // make sure the method wasn't called with new
            if (typeof new.target !== "undefined") {
                throw new Error("Method cannot be called with new.");
            }

            console.log(this.name);
        },
        enumerable: false,
        writable: true,
        configurable: true
    });

    return PersonType2;
}());