title: Get first character, symbol, number, or emoji at the start of NSString
body: <p>I would like to get only the first character, symbol, number, or emoji of an NSString.</p>
  
  <p>Since emojis are encoded as unicode surrogate pairs, just getting the first character using something like</p>
  
  <pre><code>str = [str substringToIndex:1];
  </code></pre>
  
  <p>will not work.</p>