Bump to v4.0.0.

difference.js

@@ -0,0 +1,28 @@
+var baseDifference = require('./internal/baseDifference'),
+    baseFlatten = require('./internal/baseFlatten'),
+    isArrayLikeObject = require('./isArrayLikeObject'),
+    rest = require('./rest');
+
+/**
+ * Creates an array of unique `array` values not included in the other
+ * provided arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.difference([3, 2, 1], [4, 2]);
+ * // => [3, 1]
+ */
+var difference = rest(function(array, values) {
+  return isArrayLikeObject(array)
+    ? baseDifference(array, baseFlatten(values, false, true))
+    : [];
+});
+
+module.exports = difference;