An example of angular.js controller written in ES6

ManageTeamCtrl

const _deps = [
  '$scope',
  '$log',
  '$state',
  'notify',
  'GuinnessApi',
  'campaign',
  'campaignUsers',
  'teamMembers',
  'user'
];

class ManageTeamCtrl {
  constructor(...args) {
    // Publish each service on 'this' with '_' prefix.
    _deps.map((val) => '_' + val).forEach((val, key) => this[val] = args[key]);

    this._$log.debug('CampaignManageTeamCtrl initialization');

    this.actionPromise = false;

    this.sortFields = [
      {title: 'First name', value: 'extended_user.user.first_name'},
      {title: 'Last name', value: 'extended_user.user.last_name'},
    ];

    this.campaignUsers = this._campaignUsers;

    this.availableSort = this.sortFields[0];
    this.availableSortDir = true;
    this.addedSort = this.sortFields[0];
    this.addedSortDir = true;

    this._currentUserId = this._user.getUserInfo().id;
  }

  /**
   * Check if a user is current user.
   *
   * @param campaingUser
   * @return {boolean}
   */
  isItMe(campaingUser) {
    return campaingUser.extended_user.user.id === this._currentUserId;
  }

  /**
   * Remove current user from the campaign.
   *
   */
  removeMyself() {
    // Check if there are other users.
    if (this._campaignUsers.length < 2) {
      this._notify.warning('You can\'t remove yourself because you are the only user assigned to the company');
      return;
    }

    // Get campaign user id.
    const campaignUser = _.find(this._campaignUsers, this.isItMe.bind(this));
    let successMsg = `You have been successfully removed from campaign <strong>${this._campaign.name}</strong>`;

    // Remove it from the campaign and redirect to my campaigns list.
    this.actionPromise = this._GuinnessApi.removeCampaignUser({id: campaignUser.id})
      .then(() => {
        this._$scope.$close(true);
        return this._$state.go('my_campaign');
      })
      .then(() => this._notify.success(successMsg));
  }

  /**
   * Add new team member to the campaign.
   *
   * @param teamMember
   */
  addTeamMember(teamMember) {
    this.actionPromise = this._GuinnessApi.addCampaignUser({
      campaign: this._campaign.resource_uri,
      extended_user: teamMember.extended_user.resource_uri,
    })
      .then((campaignMember) => {
        this._campaignUsers.push(campaignMember);
      });
  }

  /**
   * Get available team members list.
   *
   * Those, that are not included to the campaign.
   */
  getAvailableTeamMembers() {
    return _.filter(this._teamMembers, (teamMember) => {
      return !this._isUserInCampaign(teamMember);
    });
  }

  /**
   * Check if a user is already in the campaign.
   *
   * @param teamMember
   * @return {boolean}
   * @private
   */
  _isUserInCampaign(teamMember) {
    return !!_.find(this.campaignUsers, (user) => {
      return user.extended_user.user.id === teamMember.extended_user.user.id;
    });
  }
}

ManageTeamCtrl.$inject = _deps;

export default ManageTeamCtrl;