title: Golang: A map Interface, how to print key and value
body: <p>I get a map interface, like :</p>
  
  <pre><code>getUsersAppInfo := usersAppInfo.GetUsersAppInfo(getUserId)
  </code></pre>
  
  <p>then I print :</p>
  
  <pre><code>fmt.Println(getUsersAppInfo)
  </code></pre>
  
  <p>get this, like :</p>
  
  <pre><code>[map[appId:2 fcmServerKey:keyTestTest name:com.app]]
  </code></pre>
  
  <p>Ask : How to just print the value, like</p>
  
  <pre><code>appId value is 2 
  name value is com.app 
  fcmServerKey:keyTestTest value is keyTestTest 
  </code></pre>