JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="app" ng-controller="test">
  <div ng-repeat="(key,value) in data">
    {{key + 1}}) --
    <span ng-if="value.children.length > 0">
    {{value.children}}
    </span>
    <span ng-if="!(value.children.length > 0)">
    No children found!!
    </span>
  </div>
</div>

JavaScript

var app = angular.module('app', []);

app.controller('test', function($scope) {
  $scope.data = [{
    "id": 14,
    "discussion": 8,
    "parent": 0,
    "userid": 2,
    "subject": "communication skill discussion 2",
    "message": "<p>hi all to communication discussion 2 </p>",
    "children": [
      24,
      16,
      15
    ]
  }, {
    "id": 15,
    "discussion": 8,
    "parent": 14,
    "userid": 2,
    "subject": "Re: communication skill discussion 2",
    "message": "<p>hiiiiiiiiii</p>",
    "children": [
      25,
      23
    ],
  }, {
    "id": 23,
    "discussion": 8,
    "parent": 15,
    "userid": 2,
    "created": 1461562317,
    "modified": 1461562317,
    "mailed": 0,
    "subject": "Re: communication skill discussion 2",
    "message": "<p>helloooo</p>",
    "children": [

    ],
  }];
});