JavaScript에서 올바르게 작동하지 않는 Switch 문

var chk = '4'

switch (chk) {
  case '4':
    var locations = [
      ["936001_STURGEON_BAY_MEYER", 44.8358, -87.3305, "LRA", 1],
      ["936087_SHADOW_LAKE", 45.2183, -88.5981, "LRA", 2],
      ["936136_PIG", 44.5925, -88.0808, "OMS", 3],
      ["936136_PIG", 44.5925, -88.0808, "OMS", 4]
    ];

    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 15,
      center: new google.maps.LatLng(locations[0][1], locations[0][2]),
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    var infowindow = new google.maps.InfoWindow({
      maxWidth: 400000
    });
    var locations_all_cells1 = locations;
    var marker, i;

    for (i = 0; i < locations_all_cells1.length; i++) {
      var type1 = locations_all_cells1[i][3];

      switch (type1) {
        case "OMS":
          marker1 = new google.maps.Marker({
            position: new google.maps.LatLng(locations_all_cells1[i][1], locations_all_cells1[i][2]),
            map: map,
            icon: 'http://maps.google.com/mapfiles/ms/icons/green-dot.png'
          });
          google.maps.event.addListener(marker1, 'click', (function(marker1, i) {
            return function() {
              infowindow.setContent(locations_all_cells1[i][0]);
              infowindow.open(map, marker1);
            }
          })(marker1, i));
          break;

        case "LRA":
          marker2 = new google.maps.Marker({
            position: new google.maps.LatLng(locations_all_cells1[i][1], locations_all_cells1[i][2]),
            map: map,
            icon: 'http://maps.google.com/mapfiles/ms/icons/red-dot.png'
          });
          google.maps.event.addListener(marker2, 'click', (function(marker2, i) {
            return function() {
              infowindow.setContent(locations_all_cells1[i][0]);
              infowindow.open(map, marker2);
            }
          })(marker2, i));
          break;

        case "UPSAVE":
          marker3 = new google.maps.Marker({
            position: new google.maps.LatLng(locations_all_cells1[i][1], locations_all_cells1[i][2]),
            map: map,
            icon: 'http://maps.google.com/mapfiles/ms/icons/yellow-dot.png'
          });
          google.maps.event.addListener(marker3, 'click', (function(marker3, i) {
            return function() {
              infowindow.setContent(locations_all_cells1[i][0]);
              infowindow.open(map, marker3);
            }
          })(marker3, i));
      }
    }
    break;

  case '2':
    var locations = [
      ["936001_STURGEON_BAY_MEYER", 44.8358, -87.3305, "LRA", 1],
      ["936087_SHADOW_LAKE", 45.2183, -88.5981, "LRA", 2],
      ["936136_PIG", 44.5925, -88.0808, "OMS", 3],
      ["936136_PIG", 44.5925, -88.0808, "OMS", 4]
    ];

    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 15,
      center: new google.maps.LatLng(locations[0][1], locations[0][2]),
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    var infowindow = new google.maps.InfoWindow({
      maxWidth: 400000
    });
    var locations_all_cells = ;
    var marker, i;

    for (i = 0; i < locations_all_cells.length; i++) {
      var type1 = locations_all_cells[i][3];
    }
    break;
    
  default:
    text = "Looking forward to the Weekend";
}
console.log(text);