title: With an NSDictionary, can you determine data type of the value?
body: <p>For iOS, given some <code>NSDictionary</code> key/value pairs where strings values were added as <code>NSString</code> and <code>int</code>/<code>float</code> values were added as <code>NSNumber</code>, is there a way to test the data type of a value to see whether it is <code>NSString</code> or <code>NSNumber</code>?</p>