Bump to v4.0.0.

flip.js

@@ -0,0 +1,27 @@
+var createWrapper = require('./internal/createWrapper');
+
+/** Used to compose bitmasks for wrapper metadata. */
+var FLIP_FLAG = 512;
+
+/**
+ * Creates a function that invokes `func` with arguments reversed.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to flip arguments for.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var flipped = _.flip(function() {
+ *   return _.toArray(arguments);
+ * });
+ *
+ * flipped('a', 'b', 'c', 'd');
+ * // => ['d', 'c', 'b', 'a']
+ */
+function flip(func) {
+  return createWrapper(func, FLIP_FLAG);
+}
+
+module.exports = flip;