Bump to v4.0.0.

xor.js

@@ -0,0 +1,24 @@
+var arrayFilter = require('./internal/arrayFilter'),
+    baseXor = require('./internal/baseXor'),
+    isArrayLikeObject = require('./isArrayLikeObject'),
+    rest = require('./rest');
+
+/**
+ * Creates an array of unique values that is the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
+ * of the provided arrays.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of values.
+ * @example
+ *
+ * _.xor([2, 1], [4, 2]);
+ * // => [1, 4]
+ */
+var xor = rest(function(arrays) {
+  return baseXor(arrayFilter(arrays, isArrayLikeObject));
+});
+
+module.exports = xor;