Bump to v4.0.0.

internal/baseXor.js

@@ -0,0 +1,30 @@
+import arrayPush from './arrayPush';
+import baseDifference from './baseDifference';
+import baseUniq from './baseUniq';
+
+/**
+ * The base implementation of methods like `_.xor`, without support for
+ * iteratee shorthands, that accepts an array of arrays to inspect.
+ *
+ * @private
+ * @param {Array} arrays The arrays to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of values.
+ */
+function baseXor(arrays, iteratee, comparator) {
+  var index = -1,
+      length = arrays.length;
+
+  while (++index < length) {
+    var result = result
+      ? arrayPush(
+          baseDifference(result, arrays[index], iteratee, comparator),
+          baseDifference(arrays[index], result, iteratee, comparator)
+        )
+      : arrays[index];
+  }
+  return (result && result.length) ? baseUniq(result, iteratee, comparator) : [];
+}
+
+export default baseXor;