title: Typescript: Calling method from another method of current class
body: <p>Supposably, I have this class: </p>
  
  <pre><code>Class ExampleClass {  
      public firstMethod(){
       // Do something  
      }  
      public secondMethod(){
       //Do something with invoke firstMethod
      }
  }
  </code></pre>
  
  <p>How can I invoke first method from another correctly? (Simple "firstMethod()" is not working).</p>