Trying to use deffer on chained functions

ionic-v1
1

I have a list that I would like it to go through a function and make some fixes on that list, so I can use it later.

Because its function is depended on the result of the previous, I decided to use the chained defer, to wait one another.

 $scope.list = function(scan_result){

    var defer = $q.defer();

    defer.promise
      .then(function(){
      // Creates an object list with bssid and signal
        const ap_list = scan_result.map(str => {
        return {
          bssid: str.match(/BSSID:\s(\S*)/)[1],
          signal: str.match(/Signal:\s(\S*)/)[1]
          }
        });
        return ap_list;
      })

      .then(function(ap_list) {
        //Removes the elements that have signal bellow -50
        for (var i=0; i<ap_list.length; i++) {
          if (ap_list[i].signal < -50){
            ap_list.splice(i, 1);
          }
        }
        return ap_list;
      })

      .then(function(ap_list) {
        //Sort the elements Highest to Lowest Signal Level
        ap_list.sort(function(a,b) {
          return a.signal - b.signal;
       });
        return ap_list;
      })
      
      .then(function(ap_list) {
        //From the list keep the highest 3
        return ap_list.slice(0,2);
      })

    return defer.promise;
  }

When I output the result of the $scope.list() function on the console, it says the promise is pending and the status equals to 0.

So, defenetly something is wrong here. Im not a deffer guru so I kindly ask for your help.