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fix: spell correction to existence

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Zeel 2020-01-21 16:16:09 +05:30 • committed by GitHub
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1-js/04-object-basics/01-object/article.md
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@ -322,7 +322,7 @@ alert( *!*key*/!* in user ); // true, takes the name from key and checks for suc
```
````smart header="Using \"in\" for properties that store `undefined`"
Usually, the strict comparison `"=== undefined"` check the property existance just fine. But there's a special case when it fails, but `"in"` works correctly.
Usually, the strict comparison `"=== undefined"` check the property existence just fine. But there's a special case when it fails, but `"in"` works correctly.
It's when an object property exists, but stores `undefined`: