   <b>7.2.</b>
                        
                        ES6 &amp; TypeScript goodies
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="7.3" >
            
            <span><b>7.3.</b> Tracking state changes</span>
            
            
        </li>
    
        <li class="chapter " data-level="7.4" >
            
            <span><b>7.4.</b> Predicates</span>
            
            
        </li>
    
        <li class="chapter " 