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minor fixes

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Ilya Kantor 2021-01-13 19:54:44 +03:00
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1-js/04-object-basics/07-optional-chaining/article.md
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@ -103,7 +103,7 @@ alert( user?.address.street ); // undefined
Please note: the `?.` syntax makes optional the value before it, but not any further.
E.g. in `user?.address.street.name` the `?.` allows `user` to be `null/undefined`, but it's all it does. Further properties are accessed in a regular way. If we want some of them to be optional, then we'll need to replace more `.` with `?.`.
E.g. in `user?.address.street.name` the `?.` allows `user` to safely be `null/undefined` (and returns `undefined` in that case), but that's only for `user`. Further properties are accessed in a regular way. If we want some of them to be optional, then we'll need to replace more `.` with `?.`.
```warn header="Don't overuse the optional chaining"
We should use `?.` only where it's ok that something doesn't exist.