| [](https://travis-ci.org/fgnass/uniqs) | 
 |  | 
 | ### Tiny utility to create unions and de-duplicated lists. | 
 |  | 
 | Example: | 
 |  | 
 | ```js | 
 | var uniqs = require('uniqs'); | 
 |  | 
 | var foo = { foo: 23 }; | 
 | var list = [3, 2, 2, 1, foo, foo]; | 
 |  | 
 | uniqs(list); | 
 | // => [3, 2, 1, { foo: 23 }] | 
 | ``` | 
 |  | 
 | You can pass multiple lists to create a union: | 
 |  | 
 | ```js | 
 | uniqs([2, 1, 1], [2, 3, 3, 4], [4, 3, 2]); | 
 | // => [2, 1, 3, 4] | 
 | ``` | 
 |  | 
 | Passing individual items works too: | 
 | ```js | 
 | uniqs(3, 2, 2, [1, 1, 2]); | 
 | // => [3, 2, 1] | 
 | ``` | 
 |  | 
 | ### Summary | 
 |  | 
 | * Uniqueness is defined based on strict object equality. | 
 | * The lists do not need to be sorted. | 
 | * The resulting array contains the items in the order of their first appearance. | 
 |  | 
 | ### About | 
 |  | 
 | This package has been written to accompany utilities like | 
 | [flatten](https://npmjs.org/package/flatten) as alternative to full-blown | 
 | libraries like underscore or lodash. | 
 |  | 
 | The implementation is optimized for simplicity rather than performance and | 
 | looks like this: | 
 |  | 
 | ```js | 
 | module.exports = function uniqs() { | 
 |   var list = Array.prototype.concat.apply([], arguments); | 
 |   return list.filter(function(item, i) { | 
 |     return i == list.indexOf(item); | 
 |   }); | 
 | }; | 
 | ``` | 
 |  | 
 | ### License | 
 | MIT |