Merge pull request airbnb#126 from Jabher/patch-1

32-bit integers and bitwise operators explained with example of issues

Author: hshoff

README.md

@@ -970,7 +970,6 @@
     ```
 
   - If for whatever reason you are doing something wild and `parseInt` is your bottleneck and need to use Bitshift for [performance reasons](http://jsperf.com/coercion-vs-casting/3), leave a comment explaining why and what you're doing.
-  - **Note:** Be careful when using bitshift operations. Numbers are represented as [64-bit values](http://es5.github.io/#x4.3.19), but Bitshift operations always return a 32-bit integer ([source](http://es5.github.io/#x11.7)). Bitshift can lead to unexpected behavior for integer values larger than 32 bits. [Discussion](https://github.com/airbnb/javascript/issues/109)
 
     ```javascript
     // good
@@ -982,6 +981,14 @@
     var val = inputValue >> 0;
     ```
 
+  - **Note:** Be careful when using bitshift operations. Numbers are represented as [64-bit values](http://es5.github.io/#x4.3.19), but Bitshift operations always return a 32-bit integer ([source](http://es5.github.io/#x11.7)). Bitshift can lead to unexpected behavior for integer values larger than 32 bits. [Discussion](https://github.com/airbnb/javascript/issues/109). Largest signed 32-bit Int is 2,147,483,647:
+
+    ```javascript
+    2147483647 >> 0 //=> 2147483647
+    2147483648 >> 0 //=> -2147483648
+    2147483649 >> 0 //=> -2147483647
+    ```
+
   - Booleans:
 
     ```javascript