jeena/en.javascript.info
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

minor

Browse source
This commit is contained in:
Ilya Kantor 2017-07-09 23:41:14 +03:00
parent d1cf45eda8
commit d32eabef0f
2 changed files with 6 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

4
1-js/07-object-oriented-programming/01-property-descriptors/article.md
View file

@ -271,7 +271,7 @@ So, we can set many properties at once.
## Object.getOwnPropertyDescriptors
To get many descriptors at once, we can use the method [Object.getOwnPropertyDescriptors(obj)](mdn:js/Object/getOwnPropertyDescriptors).
To get all property descriptors at once, we can use the method [Object.getOwnPropertyDescriptors(obj)](mdn:js/Object/getOwnPropertyDescriptors).
Together with `Object.defineProperties` it can be used as a "flags-aware" way of cloning an object:
@ -289,6 +289,8 @@ for(let key in user) {
...But that does not copy flags. So if we want a "better" clone then `Object.defineProperties` is preferred.
Another difference is that `for..in` ignores symbolic properties, but `Object.getOwnPropertyDescriptors` returns *all* property descriptors including symbolic ones.
## Sealing an object globally
Property descriptors work at the level of individual properties.

6
1-js/07-object-oriented-programming/06-prototype-methods/article.md
View file

@ -51,14 +51,14 @@ alert(rabbit.jumps); // true
The descriptors are in the same format as described in the chapter <info:property-descriptors>.
We can use `Object.create` to perform a full object cloning, like this:
We can use `Object.create` to perform an object cloning more powerful than copying properties in `for..in`:
```js
// fully identical shallow clone of obj
let clone = Object.create(obj, Object.getOwnPropertyDescriptors(obj));
let clone = Object.create(Object.getPrototypeOf(obj), Object.getOwnPropertyDescriptors(obj));
```
This call makes a truly exact copy of `obj`, including all properties: enumerable and non-enumerable, data properties and setters/getters -- everything, and with the right `[[Prototype]]`. But not an in-depth copy of course.
This call makes a truly exact copy of `obj`, including all properties: enumerable and non-enumerable, data properties and setters/getters -- everything, and with the right `[[Prototype]]`.
## Brief history