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@ -23,7 +23,7 @@ alert(user.address.street); // Error!
That's the expected result. JavaScript works like this. As `user.address` is `undefined`, an attempt to get `user.address.street` fails with an error.
That said, in many practical cases we'd prefer to get `undefined` instead of an error here (meaning "no street").
In many practical cases we'd prefer to get `undefined` instead of an error here (meaning "no street").
...And another example. In the web development, we may need the information about an element on the page. We can find this element using a special method call, such as `document.querySelector('.elem')`, and it either returns an object or `null` when there's no such element.