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var baseFlatten = require('../internal/baseFlatten'),
baseUniq = require('../internal/baseUniq'),
restParam = require('../function/restParam');
/**
* Creates an array of unique values, in order, of the provided arrays using
* [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
* for equality comparisons.
*
* @static
* @memberOf _
* @category Array
* @param {...Array} [arrays] The arrays to inspect.
* @returns {Array} Returns the new array of combined values.
* @example
*
* _.union([1, 2], [4, 2], [2, 1]);
* // => [1, 2, 4]
*/
var union = restParam(function(arrays) {
return baseUniq(baseFlatten(arrays, false, true));
});
module.exports = union;
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