unify-arrays
Squashes arrays together, while making sure there aren't any duplicate values.
Installation
$ npm install unify-arrays --save-dep
Example
var unifyArrays = ; // Simple concatination of two arrays; // [1, 2, 3, 4] // ... but it can perfectly take more than 2!; // [1, 2, 3, 4, 5, 6] // and removes duplicates!; // ['a', 'b', 'c', 'd', 'e', 'f']