title: Use getter and setter
body: <p>Is is recommended to use in dart getter and setter to define a property like:</p>
  
  <pre><code>class Car {
    Engine engine;
  
    bool get isEngineRunning =&gt; engine.isRunning;
  
    void set isEngineRunning(bool isRunning) {
      engine.isRunning = isRunning;
    }
  }
  </code></pre>
  
  <p>And what is advantage of it?</p>