From 45a7219a4fac3bb9726f3888ef3fb01f7320918f Mon Sep 17 00:00:00 2001
From: Weijing Jay Lin <weijingjaylin@gmail.com>
Date: Wed, 27 Apr 2016 19:53:29 -0700
Subject: [PATCH] add demo

Add a more clear demo for the usage.
---
 src/Angular.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Angular.js b/src/Angular.js
index f14b819c53b8..a3c24ea4132a 100644
--- a/src/Angular.js
+++ b/src/Angular.js
@@ -449,6 +449,14 @@ noop.$inject = [];
        return (transformationFn || angular.identity)(value);
      };
    ```
+   ```js
+      var getResult = function (fn, val) {
+          return (fn || angular.identity)(val);
+      };
+      var result = getResult(function (n) { return n * 2; }, 3); //  result = 6
+      var null_result = getResult(null, 3);//  null_result = 3
+      var undefined_result = getResult(undefined, 3);// undefined _result = 3
+    ```
   * @param {*} value to be returned.
   * @returns {*} the value passed in.
  */