more work

node_modules/lodash/array/union.js

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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` for equality comparisons.
+ *
+ * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * comparisons are like strict equality comparisons, e.g. `===`, except that
+ * `NaN` matches `NaN`.
+ *
+ * @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;