// Option One
// get("user", "address", "postcode")
function get(){
    const keys = [...arguments];
    function check (keys = [], obj = window) {
        console.log(`keys: ${keys}`);
        console.log(obj);
        console.log("-------------");
        if (keys.length === 0) {
            return undefined;
        } else if (keys.length === 1) {
            return obj[keys[0]];
        }
        const key = keys.shift();
        if (obj[key] === undefined) {
            return undefined;
        } else {
            return check (keys, obj[key])
        }
    }
    return check(keys)
}


// Option Two
// _get(() => user.address.postcode)
// _get(() => user.address.postcode, "none")
function _get(func, fallbackValue) {
    try {
        const value = func();
        return (value === null || value === undefined) ? fallbackValue : value;
    } catch (e) {
        return fallbackValue;
    }
}