generic 'groupBy' filter using the underscore.js library. in Angular js

by manoj

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js"></script>
<div ng-app="app">
    <div ng-controller="homeCtrl">
        <ul>
            <li ng-repeat="(team, players) in teamPlayers | groupBy:'team'">
                    {{team}}
                    <ul>
                        <li ng-repeat="player in players">
                            {{player.name}}
                        </li>
                    </ul>
                </li>
        </ul>
    </div>
</div>

JavaScript

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

app.controller('homeCtrl', function($scope) {
    $scope.teamPlayers = [{name: 'Gene', team: 'team alpha'},
                      {name: 'George', team: 'team beta'},
                      {name: 'Steve', team: 'team gamma'},
                      {name: 'Paula', team: 'team beta'},
                      {name: 'Scruath of the 5th sector', team: 'team gamma'}];
});

app.filter('groupBy', function() {
    return _.memoize(function(items, field) {
            return _.groupBy(items, field);
        }
    );
});