Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="https://code.angularjs.org/1.5.0/angular.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<div ng-controller="MyCtrl">
<ul>
<li ng-repeat="i in items">{{i.type}} -- {{totalCreadit(i.data)}}</li>
</ul>
</div>

JavaScript

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

//myApp.directive('myDirective', function() {});
//myApp.factory('myService', function() {});
myApp.controller('MyCtrl',function($scope, $timeout) {
function groupBy(arr, key) {
        var newArr = [],
            types = {},
            newItem, i, j, cur;
        for (i = 0, j = arr.length; i < j; i++) {
            cur = arr[i];
            if (!(cur[key] in types)) {
                types[cur[key]] = { type: cur[key], data: [] };
                newArr.push(types[cur[key]]);
            }
            types[cur[key]].data.push(cur);
        }
        return newArr;
};
var data=[
{"displayTransactionDateTime": "Tue, 19th Sep 2017"
, "transactionDateAndTime": "2017-09-19 18:36:34.0"
, "transactionId": "158131"
, "refTransactionId": null
, "transactionType": "Credit Transfer"
, "creditType": "Transfer"
, "transactionMode": "SYSTEM CREDITS"
, "transactionCurrency": "SYSTEM CREDITS"
, "transactionAmount": "50"
, "credits": "50"
, "creditMessage": ""},{"displayTransactionDateTime": "Tue, 19th Sep 2017"
, "transactionDateAndTime": "2017-09-19 18:36:34.0"
, "transactionId": "158131"
, "refTransactionId": null
, "transactionType": "Credit Transfer"
, "creditType": "Transfer"
, "transactionMode": "SYSTEM CREDITS"
, "transactionCurrency": "SYSTEM CREDITS"
, "transactionAmount": "50"
, "credits": "100"
, "creditMessage": ""},
{"displayTransactionDateTime": "Wed, 13th Sep 2017"
, "transactionDateAndTime": "2017-09-13 09:53:28.0"
, "transactionId": "157687"
, "refTransactionId": null
, "transactionType": "Credit Purchase"
, "creditType": "Bought"
, "transactionMode": "CREDIT CARD"
, "transactionCurrency": "AED"
, "transactionAmount": "50"
, "credits": "10"
, "creditMessage": null},
{"displayTransactionDateTime": "Sat, 9th Sep 2017"
, "transactionDateAndTime": "2017-09-09 14:49:42.0"
, "transactionId": "157378"
, "refTransactionId": null
, "transactionType": "Voucher Purchase"
, "creditType": "Spent"
, "transactionMode": "SYSTEM...