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minor fixes

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Ilya Kantor 2022-03-24 08:44:50 +03:00
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commit bf510dcf62
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1-js/04-object-basics/07-optional-chaining/article.md
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@ -110,7 +110,7 @@ We should use `?.` only where it's ok that something doesn't exist.
For example, if according to our code logic `user` object must exist, but `address` is optional, then we should write `user.address?.street`, but not `user?.address?.street`.
So, if `user` happens to be undefined due to a mistake, we'll see a programming error about it and fix it. Otherwise, coding errors can be silenced where not appropriate, and become more difficult to debug.
Then, if `user` happens to be undefined, that definitely is a mistake, we'll see a programming error about it and fix it. Otherwise, if we overuse `?.`, coding errors can be silenced where not appropriate, and become more difficult to debug.
```
````warn header="The variable before `?.` must be declared"