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Ilya Kantor 2017-10-02 12:06:27 +03:00
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1-js/04-object-basics/01-object/article.md
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@ -224,9 +224,12 @@ alert(obj.__proto__); // [object Object], didn't work as intended
As we see from the code, the assignment to a primitive `5` is ignored.
That can be come a source of bugs and even vulnerabilies if we intent to store arbitrary key-value pairs in an object, and allow a visitor to specify the keys. In that case the visitor may choose "__proto__" as the key, and the assignment logic will be ruined (as shown above).
That can become a source of bugs and even vulnerabilies if we intent to store arbitrary key-value pairs in an object, and allow a visitor to specify the keys.
There's another data structure [Map](info:map-set-weakmap-weakset), that we'll learn in the chapter <info:map-set-weakmap-weakset>, which supports arbitrary keys. Also there's a way to make objects treat `__proto__` as a regular property, but first we need to know more about objects to understand it.
In that case the visitor may choose "__proto__" as the key, and the assignment logic will be ruined (as shown above).
There exist a way to make objects treat `__proto__` as a regular property, we'll cover it later, but first we need to know more about objects to understand it.
There's another data structure [Map](info:map-set-weakmap-weakset), that we'll learn in the chapter <info:map-set-weakmap-weakset>, which supports arbitrary keys. Also
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