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Ilya Kantor 2020-02-04 16:43:35 +00:00
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1-js/04-object-basics/03-symbol/article.md
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@ -178,22 +178,6 @@ alert( clone[id] ); // 123
There's no paradox here. That's by design. The idea is that when we clone an object or merge objects, we usually want *all* properties to be copied (including symbols like `id`).
````smart header="Property keys of other types are coerced to strings"
We can only use strings or symbols as keys in objects. Other types are converted to strings.
For instance, a number `0` becomes a string `"0"` when used as a property key:
```js run
let obj = {
0: "test" // same as "0": "test"
};
// both alerts access the same property (the number 0 is converted to string "0")
alert( obj["0"] ); // test
alert( obj[0] ); // test (same property)
```
````
## Global symbols
As we've seen, usually all symbols are different, even if they have the same name. But sometimes we want same-named symbols to be same entities. For instance, different parts of our application want to access symbol `"id"` meaning exactly the same property.