Use a declare tag to create named variables within a block scope. This is analogous to a variable declaration in Dart.

    This Dart code:

    1. var one = 1, two = 2, three = null;

    Becomes this Jael:

    1. <declare one=1 two=2 three>
    2.  // Scoped content...
    3. </declare>

    Another example (this is actually the test for declare functionality):

    1. <div>
    2.  <declare one=1 two=2 three=3>
    3.    <ul>
    4.     <li>{{one}}</li>
    5.     <li>{{two}}</li>
    6.     <li>{{three}}</li>
    7.    </ul>
    8.    <ul>
    9.     <declare three=4>
    10.       <li>{{one}}</li>
    11.       <li>{{two}}</li>
    12.       <li>{{three}}</li>
    13.     </declare>
    14.    </ul>
    15.  </declare>
    16. </div>

    Which yields:

    1. <div>
    2.   <ul>
    3.     <li>
    4.       1
    5.     </li>
    6.     <li>
    7.       2
    8.     </li>
    9.     <li>
    10.       3
    11.     </li>
    12.   </ul>
    13.   <ul>
    14.     <li>
    15.       1
    16.     </li>
    17.     <li>
    18.       2
    19.     </li>
    20.     <li>
    21.       4
    22.     </li>
    23.   </ul>
    24. </div>