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# map-obj [](https://travis-ci.org/sindresorhus/map-obj)
> Map object keys and values into a new object
## Install
```
$ npm install --save map-obj
```
## Usage
```js
const mapObj = require('map-obj');
const newObject = mapObj({foo: 'bar'}, (key, value) => [value, key]);
//=> {bar: 'foo'}
```
## API
### mapObj(source, mapper, [options])
#### source
Type: `Object`
Source object to copy properties from.
#### mapper
Type: `Function`
Mapping function.
- It has signature `mapper(sourceKey, sourceValue, source)`.
- It must return a two item array: `[targetKey, targetValue]`.
#### deep
Type: `boolean`<br>
Default: `false`
Recurse nested objects and objects in arrays.
#### target
Type: `Object`<br>
Default: `{}`
Target object to map properties on to.
## Related
- [filter-obj](https://github.com/sindresorhus/filter-obj) - Filter object keys and values into a new object
- [object-assign](https://github.com/sindresorhus/object-assign) - Copy enumerable own properties from one or more source objects to a target object
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)
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