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docs: add output comment in Symbols article

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Radliński Ignacy 2022-06-27 22:44:33 +02:00 • committed by GitHub
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1-js/04-object-basics/08-symbol/article.md
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@ -169,7 +169,7 @@ for (let key in user) alert(key); // name, age (no symbols)
*/!*
// the direct access by the symbol works
alert( "Direct: " + user[id] );
alert( "Direct: " + user[id] ); // Direct: 123
```
[Object.keys(user)](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys) also ignores them. That's a part of the general "hiding symbolic properties" principle. If another script or a library loops over our object, it won't unexpectedly access a symbolic property.