Bump to v4.0.0.

differenceWith.js

@@ -0,0 +1,36 @@
+import baseDifference from './internal/baseDifference';
+import baseFlatten from './internal/baseFlatten';
+import isArrayLikeObject from './isArrayLikeObject';
+import last from './last';
+import rest from './rest';
+
+/**
+ * This method is like `_.difference` except that it accepts `comparator`
+ * which is invoked to compare elements of `array` to `values`. The comparator
+ * is invoked with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The values to exclude.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ *
+ * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
+ * // => [{ 'x': 2, 'y': 1 }]
+ */
+var differenceWith = rest(function(array, values) {
+  var comparator = last(values);
+  if (isArrayLikeObject(comparator)) {
+    comparator = undefined;
+  }
+  return isArrayLikeObject(array)
+    ? baseDifference(array, baseFlatten(values, false, true), undefined, comparator)
+    : [];
+});
+
+export default differenceWith;