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Fix some confusing expression

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LeviDing 2020-07-12 18:45:38 +08:00 • committed by GitHub
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1-js/04-object-basics/07-optional-chaining/article.md
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@ -74,7 +74,7 @@ For example, if according to our coding logic `user` object must be there, but `
So, if `user` happens to be undefined due to a mistake, we'll know about it and fix it. Otherwise, coding errors can be silenced where not appropriate, and become more difficult to debug.
```
````warn header="The variable before `?.` must exist"
````warn header="The variable before `?.` must be declared"
If there's no variable `user`, then `user?.anything` triggers an error:
```js run