Bump to v4.0.0.

xor.js

@@ -0,0 +1,22 @@
+define(['./internal/arrayFilter', './internal/baseXor', './isArrayLikeObject', './rest'], function(arrayFilter, baseXor, isArrayLikeObject, 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));
+  });
+
+  return xor;
+});