javascript - create an object containing objects based on JSON data

Based on JSON data I receive, I am trying to track a team's home and away games. The JSON data is stored in $scope.gameSchedules and has "team1" for home games and "team2" for away games. I need to initially create an object with each team's name and the only way I can get all the teams' names is via the "team1/team2" values in the initial JSON data (thus the two loops below). This was my working solution to create an object that looks like this (called homeVsAwayGames):

The initial JSON data response:

Here is my code. Is there a better way to do it, or more concise, perhaps using underscore (not necessary)? I feel that perhaps I have too many lines of code and it can be refactored:

```
$scope.getSchedules = function() {
return TeamsScheduleService.getTeamSchedules().then(function(response) {
$scope.gamesSchedule = response.data.games;
}, function(err) {
console.log("there was an error getting the schedules");
})
}
$scope.homeVsAwaySchedules = {};
$scope.getSchedules().then(trackHomeVsAway).then(function(){
console.log($scope.homeVsAwaySchedules);
})
//TODO: ng-repeat over the homeVsAwaySchedules Object to display in the view.

function trackHomeVsAway() {
//initialize homeVsAwaySchedules object in separate loop for efficiency and readability, instead of trying to initialize + tally at the same time.
$scope.gamesSchedule.forEach(function(gameData) {
var homeTeam = gameData.team1;
var awayTeam = gameData.team2;
if (homeTeam) {
if (!$scope.homeVsAwaySchedules[homeTeam]) {
$scope.homeVsAwaySchedules[homeTeam] = {
"Home Games": 0,
"Away Games": 0
};
}
}
if (awayTeam) {
if (!$scope.homeVsAwaySchedules[awayTeam]) {
$scope.homeVsAwaySchedules[awayTeam] = {

You could dry up this code by adding some helper functions.

For example instead of this:

$scope.gamesSchedule.forEach(function(gameData) {
  var homeTeam = gameData.team1;
  var awayTeam = gameData.team2;
    if (homeTeam) {
        if (!$scope.homeVsAwaySchedules[homeTeam]) {
            $scope.homeVsAwaySchedules[homeTeam] = {
                "Home Games": 0,
                "Away Games": 0
            };
        }
    }
    if (awayTeam) {
        if (!$scope.homeVsAwaySchedules[awayTeam]) {
            $scope.homeVsAwaySchedules[awayTeam] = {
                "Home Games": 0,
                "Away Games": 0
            };
        }
    }
})

You could write using a helper function:

$scope.gamesSchedule.forEach(function(gameData) {
    function checkTeam(team) {
        if (team) {
            if (!$scope.homeVsAwaySchedules[team]) {
                $scope.homeVsAwaySchedules[team] = {
                    "Home Games": 0,
                    "Away Games": 0
                };
            }
        }
    }
    checkTeam(gameData.team1);
    checkTeam(gameData.team2);
})

Similarly, instead of this:

$scope.gamesSchedule.forEach(function(gameData) {
  var homeTeam = gameData.team1;
  var awayTeam = gameData.team2;
    if (homeTeam) {
        if ($scope.homeVsAwaySchedules[homeTeam]) {
            $scope.homeVsAwaySchedules[homeTeam]["Home Games"]++;
        }
    }
    if (awayTeam) {
        if ($scope.homeVsAwaySchedules[awayTeam]) {
            $scope.homeVsAwaySchedules[awayTeam]["Away Games"]++;
        }
    }
})

You could write using a helper function:

$scope.gamesSchedule.forEach(function(gameData) {
    function updateTeamSchedule(team, games) {
        if (team) {
            if ($scope.homeVsAwaySchedules[team]) {
                $scope.homeVsAwaySchedules[team][games]++;
            }
        }
    }
    updateTeamSchedule(gameData.team1);
    updateTeamSchedule(gameData.team2);
})

StackExchange Code Review Q#136582, answer score: 4