diff --git a/lodash.js b/lodash.js
index 9c68f3241..d432343be 100644
--- a/lodash.js
+++ b/lodash.js
@@ -4922,8 +4922,11 @@
           result = hasFunc(object, path);
         }
       }
-      return result || (isLength(object && object.length) && isIndex(path, object.length) &&
-        (isArray(object) || isString(object) || isArguments(object)));
+      var length = object ? object.length : undefined;
+      return result || (
+        !!length && isLength(length) && isIndex(path, length) &&
+        (isArray(object) || isString(object) || isArguments(object))
+      );
     }
 
     /**
@@ -5012,9 +5015,11 @@
      */
     function indexKeys(object) {
       var length = object ? object.length : undefined;
-      return (isLength(length) && (isArray(object) || isString(object) || isArguments(object)))
-        ? baseTimes(length, String)
-        : null;
+      if (isLength(length) &&
+          (isArray(object) || isString(object) || isArguments(object))) {
+        return baseTimes(length, String);
+      }
+      return null;
     }
 
     /**
@@ -9551,7 +9556,7 @@
      */
     function isEmpty(value) {
       if (isArrayLike(value) &&
-          (isArray(value) || isString(value) || isArguments(value) || isFunction(value.splice))) {
+          (isArray(value) || isString(value) || isFunction(value.splice) || isArguments(value))) {
         return !value.length;
       }
       for (var key in value) {