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1.angular//Ralat semasa menjalankan program Ralat: [$injector:unpr] Pembekal tidak diketahui: uniqueFilterProvider <- uniqueFilter
2 Kod berkaitan

<!DOCTYPE html>
<html lang="en" data-ng-app="sportsStore">
<head>
    <meta charset="UTF-8">
    <title>SportsStore</title>
    <script src="angular.js"></script>
    <link rel="stylesheet" href="bootstrap-theme.css">
    <link rel="stylesheet" href="bootstrap.css">
    <script>
        angular.module("sportsStore", ["customFilters"]);
    </script>
    <script src="controllers/sportsStore.js"></script>
    <script src="filters/customFilters.js"></script>
</head>
<body ng-controller="sportsStoreCtrl">
<p class="navbar navbar-inverse">
    <a href="#" class="navbar-brand">SportsStore</a>
</p>
<p class="panel panel-default row">
    <p class="col-xs-3">
        <a href="" ng-click="selectCategory()" class="btn btn-default btn-block btn-lg">Home</a>
        <a href="" ng-repeat="item in data.products | orderBy:'category' | unique:'category' "
           ng-click="selectCategory(item)"
           class="btn btn-block btn-default btn-lg">{{item}}</a>
    </p>
    <p class="col-xs-8">
        <p class="well" ng-repeat="item in data.products">
            <h3>
                <strong>{{item.name}}</strong>
                <span class="pull-right label label-primary">{{item.price|currency}}</span>
            </h3>
            <span class="lead">{{item.description}}</span>
        </p>
    </p>
</p>
</body>
</html>

customFilters.js

angular.module("customFilters",[])
.filter("unique", function () {
    return function (data,propertyName) {
        if(angular.isArray(data)&&angular.isString(propertyName)){
var results=[];
            var keys={};
            for (var i=0;i<data.length;i++){
                var val=data[i][propertyName];
                if(angular.isUndefined(keys[val])){
                    keys[val]=true;
                    results.push(val)
                }
            }
            return results;
        }else {
            return data;
        }
    }
})

Sepatutnya masalah dengan penapis saya baru mula belajar dan saya tidak dapat mencari apa yang salah