 understand what is a Handlebars context, what are helper parameters, and the difference between expression helpers and block helpers.</p>

<p>Now let&rsquo;s dive a little bit deeper into HBHelperCallingInfo.</p>

<h2>What is HBHelperCallingInfo</h2>

<p>The typical implementation of a helper using an objective-C block looks like the following:</p>

<pre><code> HBHelperBlock myHelper = (^)(HBHelperCallingInfo* callingInfo) {
     // helper code
     // ....
     return result; // where result is a string c