From aa0d6ca19db1f1d9c985bbd06706ba8baf8f9e3b Mon Sep 17 00:00:00 2001
From: Akim McMath <akim.elijah.mcmath@gmail.com>
Date: Wed, 15 Jun 2016 18:34:54 -0700
Subject: [PATCH] Fix: for...in loop

`for...in` loop should iterate over own enumerable properties only.
---
 src/deep-map-keys.ts | 6 ++++--
 tslint.json          | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/deep-map-keys.ts b/src/deep-map-keys.ts
index b0f6d93..73a2b6b 100644
--- a/src/deep-map-keys.ts
+++ b/src/deep-map-keys.ts
@@ -43,8 +43,10 @@ function mapObject(obj: {[key: string]: any}, fn: MapFn, opts: Options): {[key:
   let result: {[key: string]: any} = {};
 
   for (let key in obj) {
-    let value = obj[key];
-    result[fn.call(opts.thisArg, key, value)] = map(value, fn, opts);
+    if (obj.hasOwnProperty(key)) {
+      let value = obj[key];
+      result[fn.call(opts.thisArg, key, value)] = map(value, fn, opts);
+    }
   }
 
   return result;
diff --git a/tslint.json b/tslint.json
index a01a39f..a1cba23 100644
--- a/tslint.json
+++ b/tslint.json
@@ -23,7 +23,7 @@
     }],
     "ban": false,
     "curly": false,
-    "forin": false,
+    "forin": true,
     "label-position": true,
     "no-arg": true,
     "no-bitwise": false,