UserHasTeam for CRM 2013 - Check if a user belongs to X team with Javascript

Method to check if the user belongs to X team, looking by name:

You can call it this way:

if(UserhasTeam("Sales Managers")){
           // Do something
}else{}


function UserHasTeam(teamName) {
    ///<summary>
    /// Checks to see if the current user is a member of a team with the passed in name.
    ///</summary>
    ///<param name="teamName" type="String">
    /// A String representing the name of the team to check if the user is a member of.
    ///</param>
    // build endpoint URL
    var serverUrl = Xrm.Page.context.getClientUrl();
    var oDataEndpointUrl = serverUrl + "/XRMServices/2011/OrganizationData.svc/";
                var result = false;
    // query to get the teams that match the name
    oDataEndpointUrl += "TeamSet?$select=Name,TeamId&$filter=Name eq '" + teamName + "'";
    //var service = GetRequestObject();
    var service = new XMLHttpRequest();
    service.open("GET", oDataEndpointUrl, false);
    service.setRequestHeader("Accept", "application/json");
    service.setRequestHeader("Content-Type", "application/json;charset=utf-8");
    service.onreadystatechange = function() {
        if (service.readyState == 4) {
            if (service.status == 200) {
                debugger;
                var requestResults = JSON.parse(service.responseText).d;
                if (requestResults != null && requestResults.results.length > 0) {
                    var teamCounter;
                    // iterate through all of the matching teams, checking to see if the current user has a membership
                    for (teamCounter = 0; teamCounter < requestResults.results.length; teamCounter++) {
                        var team = requestResults.results[teamCounter];
                        var teamId = team.TeamId;
                        // get current user teams
                        var currentUserTeams = getUserTeams(teamId);
                        // Check whether current user teams matches the target team
                        if (currentUserTeams != null) {
                            for (var i = 0; i < currentUserTeams.length; i++) {
                                var userTeam = currentUserTeams[i];
                                // check to see if the team guid matches the user team membership id
                                if (GuidsAreEqual(userTeam.TeamId, teamId)) {
                                    result = true;
                                }
                            }
                        } else {
                            result =  false;
                        }
                    }
                } else {
                    alert("Team with name '" + teamName + "' not found");
                    result =  false;
                }
            }
        }
    };
    service.send();
             
                return result;
}

function getUserTeams(teamToCheckId) {
    // gets the current users team membership
    var userId = Xrm.Page.context.getUserId().substr(1, 36);
    var serverUrl = Xrm.Page.context.getClientUrl();
                var result;
             
    var oDataEndpointUrl = serverUrl + "/XRMServices/2011/OrganizationData.svc/";
    oDataEndpointUrl += "TeamMembershipSet?$filter=SystemUserId eq guid' " + userId + " ' and TeamId eq guid' " + teamToCheckId + " '";
             
                var service = new XMLHttpRequest();
    service.open("GET", oDataEndpointUrl, false);
    service.setRequestHeader("Accept", "application/json");
    service.setRequestHeader("Content-Type", "application/json;charset=utf-8");
    service.onreadystatechange = function() {
        if (service.readyState == 4) {
            if (service.status == 200) {
                                                                // get user teams
                debugger;
                                                                var requestResults = JSON.parse(service.responseText).d;
                                                                if (requestResults != null && requestResults.results.length > 0) {
                                                                                result = requestResults.results;
                                                                }
                                                }
                                }
                }
                service.send();
                return result;
}

function GuidsAreEqual(guid1, guid2) {
    // compares two guids
    var isEqual = false;
    if (guid1 == null || guid2 == null) {
        isEqual = false;
    } else {
        isEqual = (guid1.replace(/[{}]/g, "").toLowerCase() == guid2.replace(/[{}]/g, "").toLowerCase());
    }
    return isEqual;
}