Simplify baseFunctions.

lodash.js

@@ -1906,18 +1906,9 @@
      * @returns {Array} Returns the new array of filtered property names.
      */
     function baseFunctions(object, props) {
-      var index = -1,
-          length = props.length,
-          resIndex = -1,
-          result = [];
-
-      while (++index < length) {
-        var key = props[index];
-        if (isFunction(object[key])) {
-          result[++resIndex] = key;
-        }
-      }
-      return result;
+      return arrayFilter(props, function(key) {
+        return isFunction(object[key]);
+      });
     }
 
     /**