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Merge pull request #1339 from paroche/patch-29

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Ilya Kantor 2019-09-14 09:32:16 +03:00 • committed by GitHub
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@ -308,9 +308,9 @@ Here we have the following inheritance chain: `rabbit` inherits from `animal`, t
Note, there's one funny thing. Where is the method `rabbit.hasOwnProperty` coming from? We did not define it. Looking at the chain we can see that the method is provided by `Object.prototype.hasOwnProperty`. In other words, it's inherited.
...But why `hasOwnProperty` does not appear in `for..in` loop, like `eats` and `jumps`, if it lists all inherited properties.
...But why does `hasOwnProperty` not appear in the `for..in` loop like `eats` and `jumps` do, if `for..in` lists inherited properties?
The answer is simple: it's not enumerable. Just like all other properties of `Object.prototype`, it has `enumerable:false` flag. That's why they are not listed.
The answer is simple: it's not enumerable. Just like all other properties of `Object.prototype`, it has `enumerable:false` flag. And `for..in` only lists enumerable properties. That's why it and the rest of the `Object.prototype` properties are not listed.
```smart header="Almost all other key/value-getting methods ignore inherited properties"
Almost all other key/value-getting methods, such as `Object.keys`, `Object.values` and so on ignore inherited properties.