# Helpers
Helpers don't return features or alter the current feature collection.

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<a id="getuniquevalues">#</a> **getUniqueValues**(field, options) [<>](https://github.com/afogelberg/geomangler/blob/master/lib/helpers/getuniquevalues.js)<br>
Returns all unique values from a specified field.  

**Parameters**<br>
`field`<br>
Field name to look up unique values from<br>
`options` *optional object*<br>
features | Optional features to use.

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<a id="getfieldnames">#</a> **getFieldNames**(options) [<>](https://github.com/afogelberg/geomangler/blob/master/lib/helpers/getfieldnames.js)<br>
Returns all field names based on the first feature in the collection.  

**Parameters**<br>
`options` *optional object*<br>
features | Optional features to use.  

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