gistfile1.js

var todoApp,
    model;

model = {
    user: 'Adam',
    items: []
};

todoApp = angular.module('todoApp', []);

todoApp.run(function ($http) {
    $http.get('./todo.json').success(function (data) {
        model.items = data;
    });
});

todoApp.controller('TodoController', function ($scope) {
    $scope.todo = model;

    $scope.incompleteCount = function () {
        return $scope.todo.items.filter(function (item) {
            return !item.done;
        }).length;
    };

    $scope.warningLevel = function () {
        return $scope.incompleteCount() > 2 ? 'warning' : 'success';
    };

    $scope.addNewItem = function (actionText) {
        return $scope.todo.items.push({
            name: actionText,
            done: false
        });
    };
});

todoApp.filter('checkedItems', function () {
    return function (items, showComplete) {
        var resultItems = [];
        angular.forEach(items, function (item) {
            if (item.done === false || showComplete === true) {
                resultItems.push(item);
            }
        });
        return resultItems;
    }; 
});

gistfile2.json

[{"name": "Get the book", "done": true}, {"name": "Finish reading the book", "done": false}, {"name": "Summarize the book", "done": false}]