Update deepFreeze.md

fix typo in line 15, and add missing typeof call

snippets/deepFreeze.md

@@ -6,13 +6,13 @@ tags: object,recursion,intermediate
 Deep freezes an object.
 
 Use `Object.keys()` to get all the properties of the passed object, `Array.prototype.forEach()` to iterate over them.
-Call `Object.freeze(obj)` recursively on all properties, checking if each one is frozen using `Object.isFrozen()` and applying `deepFreeze()` as necessary.
+Call `Object.freeze(obj)` recursively on all properties, checking if each object is frozen using `Object.isFrozen()` and applying `deepFreeze()` as necessary.
 Finally, use `Object.freeze()` to freeze the given object.
 
 ```js
 const deepFreeze = obj => {
   Object.keys(obj).forEach(prop => {
-    if (obj[prop] === 'object' && !Object.isFrozen(obj[prop])) deepFreeze(v[prop]);
+    if (typeof(obj[prop]) === 'object' && !Object.isFrozen(obj[prop])) deepFreeze(obj[prop]);
   });
   return Object.freeze(obj);
 };