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closes #1309

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Ilya Kantor 2019-09-02 23:19:07 +03:00
parent e8091b1a72
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1-js/07-object-properties/01-property-descriptors/article.md
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@ -224,10 +224,10 @@ Making a property non-configurable is a one-way road. We cannot change it back w
To be precise, non-configurability imposes several restrictions on `defineProperty`:
1. Can't change `configurable` flag.
2. Can't change `enumerable` flag.
3. If a property is non-writable, then can't make it writable or change value.
4. Can't change `get/set` for an accessor property.
3. Can't change `writable: false` to `true` (the other way round works).
4. Can't change `get/set` for an accessor property (but can assign them if absent).
So, few things about the property still can be changed. E.g. a value may change, if the property is writable. The idea is that we can't change flags of a non-configurable property.
Notable exception: a value of non-configurable, but writable property still can be changed.
Here we are making `user.name` a "forever sealed" constant: