title: angular2 array of boolean
body: <p>When declaring this :</p>
  
  <pre><code>public isCollapsedDet : boolean[][];
  public isCollapsedCyc : boolean[] ;
  </code></pre>
  
  <p>I got the following error message :</p>
  
  <pre><code>/nestedForm/src/app/app.component.ts (95,7): Type 'boolean' is not assignable to type 'boolean[][]'.
  </code></pre>
  
  <p>I just need to get array as the following :</p>
  
  <pre><code>isCollapsedCyc[0] = true;
  isCollapsedCyc[1] = false;
  //
  isCollapsedDet[0, 0] = true;
  isCollapsedDet[0, 1] = true;
  isCollapsedDet[1, 0] = false;
  isCollapsedDet[1, 1] = true;
  </code></pre>