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# map-visit [](https://www.npmjs.com/package/map-visit) [](https://npmjs.org/package/map-visit) [](https://travis-ci.org/jonschlinkert/map-visit)
Map `visit` over an array of objects.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save map-visit
```
## Usage
```js
var mapVisit = require('map-visit');
```
## Assign or Merge vs. Visit
Let's say you want to add a `set` method to your application that will:
* set key-value pairs on a `data` object
* extend objects onto the `data` object
* extend arrays of objects onto the data object
**Example using `extend`**
Here is one way to accomplish this using Lo-Dash's `extend`:
```js
var _ = require('lodash');
var obj = {
data: {},
set: function (key, value) {
if (Array.isArray(key)) {
_.extend.apply(_, [obj.data].concat(key));
} else if (typeof key === 'object') {
_.extend(obj.data, key);
} else {
obj.data[key] = value;
}
}
};
obj.set('a', 'a');
obj.set([{b: 'b'}, {c: 'c'}]);
obj.set({d: {e: 'f'}});
console.log(obj.data);
//=> {a: 'a', b: 'b', c: 'c', d: { e: 'f' }}
```
The above approach works fine for most use cases. But **if you also want to emit an event** each time a property is added to the `data` object. A better approach would be to use `visit`.
**Example using `visit`**
In this approach, when an array is passed to `set`, `mapVisit` calls `set` on each object in the array. When an object is passed, `visit` calls `set` on each property in the object. As a result, the `data` event will be emitted every time a property is added to `data`.
```js
var mapVisit = require('map-visit');
var visit = require('object-visit');
var obj = {
data: {},
set: function (key, value) {
if (Array.isArray(key)) {
mapVisit(obj, 'set', key);
} else if (typeof key === 'object') {
visit(obj, 'set', key);
} else {
// some event-emitter
console.log('emit', key, value);
obj.data[key] = value;
}
}
};
obj.set('a', 'a');
obj.set([{b: 'b'}, {c: 'c'}]);
obj.set({d: {e: 'f'}});
obj.set({g: 'h', i: 'j', k: 'l'});
console.log(obj.data);
//=> {a: 'a', b: 'b', c: 'c', d: { e: 'f' }, g: 'h', i: 'j', k: 'l'}
// events would look something like:
// emit a a
// emit b b
// emit c c
// emit d { e: 'f' }
// emit g h
// emit i j
// emit k l
```
## About
### Related projects
* [collection-visit](https://www.npmjs.com/package/collection-visit): Visit a method over the items in an object, or map visit over the objects… [more](https://github.com/jonschlinkert/collection-visit) | [homepage](https://github.com/jonschlinkert/collection-visit "Visit a method over the items in an object, or map visit over the objects in an array.")
* [object-visit](https://www.npmjs.com/package/object-visit): Call a specified method on each value in the given object. | [homepage](https://github.com/jonschlinkert/object-visit "Call a specified method on each value in the given object.")
### Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
### Building docs
_(This document was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme) (a [verb](https://github.com/verbose/verb) generator), please don't edit the readme directly. Any changes to the readme must be made in [.verb.md](.verb.md).)_
To generate the readme and API documentation with [verb](https://github.com/verbose/verb):
```sh
$ npm install -g verb verb-generate-readme && verb
```
### Running tests
Install dev dependencies:
```sh
$ npm install -d && npm test
```
### Author
**Jon Schlinkert**
* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
### License
Copyright © 2016, [Jon Schlinkert](https://github.com/jonschlinkert).
Released under the [MIT license](https://github.com/jonschlinkert/map-visit/blob/master/LICENSE).
***
_This file was generated by [verb](https://github.com/verbose/verb), v0.9.0, on August 05, 2016._
|
