how to remove ifs from js (angular.js) and use filters/reduce

remove_ifs.js

var ids = [];

if ($scope.attendeesToggle) { ids = ids.concat($scope.eventAttendees); }
if ($scope.waitingListToggle) { ids = ids.concat($scope.eventWaitingList); }

//--------

[
  { condition: () => $scope.attendeesToggle, array: $scope.eventAttendees },
  { condition: () => $scope.waitingListToggle, array: $scope.eventWaitingList }
]
  .filter(({condition}) => condition() )
  .reduce((res, {array}) => res.concat(array), [])

//---------

$scope.attendees = {
  toggle: true,
  users: []
}

$scope.waitingList = {
  toggle: true,
  users: []
}

['attendees', 'waitingList'].filter((x) => x.toggle ).reduce((res, acum) => res.concat(acum), [])

//---------
$scope.attendeesToggle 
$scope.eventAttendees

$scope.waitingListToggle
$scope.eventWaitingList


[
{
  toggle: 'attendeesToggle', event: 'eventAttendees'
},
{
  toggle: 'waitingListToggle', event: 'eventWaitingList'
},
].filter((obj) => $scope[obj.toggle])
.reduce((res, e) => $scope[obj.event], [])