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Ilya Kantor 2017-03-30 13:28:35 +03:00
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1-js/04-object-basics/03-symbol/article.md
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@ -233,6 +233,4 @@ Other symbols will also become familiar when we study the corresponding language
- Symbols created with `Symbol(name)` are always different, even if they have the same name. If we want same-named symbols to be equal, then we should use the global registry: `Symbol.for(name)` returns (creates if needed) a global symbol with the given name. Multiple calls return the same symbol.
- There are system symbols used by JavaScript and accessible as `Symbol.*`. We can use them to alter some built-in behaviors.
Technically, symbols are not 100% hidden. There is a build-in method [Object.getOwnPropertySymbols(obj)](mdn:js/Object/getOwnPropertySymbols) that allows to get all symbols. Also there is a method named [Reflect.ownKeys(obj)](mdn:js/Reflect/ownKeys) that returns *all* keys of an object including symbolic ones. So they are not really hidden.
But most libraries, built-in methods and syntax constructs adhere to a common agreement that they are. And the one who explicitly calls the aforementioned methods probably understands well what he's doing.
Technically, symbols are not 100% hidden. There is a build-in method [Object.getOwnPropertySymbols(obj)](mdn:js/Object/getOwnPropertySymbols) that allows to get all symbols. Also there is a method named [Reflect.ownKeys(obj)](mdn:js/Reflect/ownKeys) that returns *all* keys of an object including symbolic ones. So they are not really hidden. But most libraries, built-in methods and syntax constructs adhere to a common agreement that they are. And the one who explicitly calls the aforementioned methods probably understands well what he's doing.