javascript - AngularJS Using $timeout giving undefined error -

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im trying make 1 of these memorization games, u need flip 2 cards on , try match images on other side otherwise both turn over.

my code working fine, except need add delay/pause before 2 cards flipped on if no match made. i'm trying use $timeout, i'm getting error: typeerror: cannot set property 'isflipped' of undefined

html

<body ng-controller="mainctrl main"> <figure ng-class="{true: 'flipped', false: 'not-flipped'}[card.isflipped]" class="card"          ng-repeat="card in cards" ng-click="flipcard(card.id, card.pair)">   <img ng-src="img/cardback1.png" class="back"></img>   <img ng-src="{{card.img}}" class="front"></img> </figure> </body>

myctrl

angular.module('cardapp').controller('mainctrl', ['$scope', '$timeout', function($scope, $timeout) {    $scope.cards = [     {       img: 'img/chantal1.jpg',       id: 1,       isflipped: false,       pair: 1,       matched: false,     },     {       img: 'img/chantal1.jpg',       id: 2,       isflipped: false,       pair: 1,       matched: false,     },     {       img: 'img/chantal2.jpg',       id: 3,       isflipped: false,       pair: 2,       matched: false,     },     {       img: 'img/chantal2.jpg',       id: 4,       isflipped: false,       pair: 2,       matched: false,     },     {       img: 'img/chantal3.jpg',       id: 5,       isflipped: false,       pair: 3,       matched: false,     },     {       img: 'img/chantal3.jpg',       id: 6,       isflipped: false,       pair: 3,       matched: false,     },      ];    $scope.unflipcards = function(k, i) {     $scope.cards[k].isflipped = false;     $scope.cards[i].isflipped = false;   };    $scope.flipcard = function(id, pair) {      var cards = $scope.cards;      for(var = 0, j = cards.length; < j; i++) {       // find card id in cards not matched       if(cards[i].id == id && cards[i].matched == false) {         // flip card         cards[i].isflipped = !cards[i].isflipped;         // check if other cards flipped         for(var k = 0, j; k < j; k++) {           // if find card flipped , not yet matched           if(cards[k].isflipped == true && cards[k].matched == false && cards[k].id != id) {             // check if card pair current card             if(cards[k].pair == pair) {               // set matched true               cards[k].matched = true;               cards[i].matched = true;             } else {               $timeout(function(){$scope.unflipcards(k, i)}, 1000); // undefined error               //$scope.unflipcards(k, i); // works             }           }         }       }     }    };    }]);

i try reproduct in jsfiddle now

by end of cycle, k , i 1 above last cards index. both $scope.cards[k] , $scope.cards[i] don't exist , therefor undefined.

you this:

$scope.unflipcardstimeout = function(k, i) {     $timeout(function(){$scope.unflipcards(k, i)}, 1000); };

and in loop replace:

$timeout(function(){$scope.unflipcards(k, i)}, 1000);

with:

$scope.unflipcardstimeout(k, i);

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