d2-ui
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# fill-keys [](https://travis-ci.org/bendrucker/fill-keys)
> Fill keys in a destination that are defined on the source. Copies descriptors so properties like `enumerable` will persist.
## Install
```
$ npm install --save fill-keys
```
## Usage
```js
var fillKeys = require('fill-keys');
fillKeys(destination, source);
//=> missing destination keys in source are copied
```
fill-keys will copy descriptors. It will also copy the `source.prototype` properties onto `destination.prototype` if both `destination` and `source` are functions.
## API
#### `fillKeys(destination, source)` -> `destination`
#### `destination`
*Required*
Type: `any`
The destination object where keys from `source` will be added.
#### source
*Required*
Type: `any`
The source object from which to copy properties.
#### `fillKeys.es3(destination, source)` -> `destination`
An ES3-compatible version of `fillKeys`. Behavior is identical but simple assignment is used instead of `Object.defineProperty`.
## License
MIT © [Ben Drucker](http://bendrucker.me)