javascript - Why track by $index is necessary for ng-click to trigger inside nested ng-repeat -

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i using ng-click inside nested ng-repeat found inner ng-click(3rd level) not getting triggered. when used track $index inner ng-repeat, ng-click got triggered. not able understand behavior of nested ng-repeat.

please find below code snippet

<ul class="a">     <li class="b" ng-repeat="items in objects track $index" ng-click="callsomething()">         <a>{{items.name}}</a>         <ul class="c">             <li class="d" ng-repeat="items1 in objects1 track $index" ng-click="callsomething()">                 <a>{{items1.name}}</a>                 <ul class="e">                     <li class="f" ng-repeat="items2 in objects3 track $index" ng-click="callsomething()">                         <a>{{items3.name}}</a>                     </li>                 </ul>             </li>         </ul>     </li> </ul>

its related ng-repeat behavior. each element tracked uniquely , mapped scope. think thread answers questions:

how ng-repeat work?


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