How do i call function that already declared in angularjs controller? -

i have defined function in angularjs controller. if call somewhere in same controller it's not working.

controller.js

function manageproductcontroller($http, $scope, $mddialog, $document, $location, $localstorage) {      var vm = this;      vm.uid = $localstorage._id;          vm.purchased = '';         $scope.types = [{code:1, type:'available items'}, {code:2, type:'purchased items'}, {code:3, type:'guest contributed'}, {code:4, type:'full list'}];          $scope.update();           $scope.update = function() {             if($scope.selectedcode == 1){                 vm.purchased = "yes";             }else if($scope.selectedcode == 2){                 vm.purchased = "";             }else{                 vm.purchased = "no";             }       $http({             url: 'http://localhost:7200/api/manage-product',             method: 'post',             data: {userid:vm.uid, code:vm.purchased}         }).success(function(res) {             //$scope.productlist = res;             //console.log(vm.result);              vm.result = res.result;             vm.count=vm.result.length;             //console.log(vm.result);              if(vm.count == 0){                 vm.showmessage = true;             } else {                 vm.result=res.result;                    vm.showmessage = false;               }              //console.log(vm.result);             //vm.docs=res.docs;         }, function(error) {             console.log(error);             alert('here');         });     };   } 

in above code $scope.update(); not working. have searched many things in google have called in same way in case it's not working. don't know wrong.

as @svarog said have call function before declaration of it, try this.

function manageproductcontroller($http, $scope, $mddialog, $document, $location, $localstorage) {    var vm = this;    vm.uid = $localstorage._id;    vm.purchased = '';     $scope.types = [{code:1, type:'available items'}, {code:2, type:'purchased items'}, {code:3, type:'guest contributed'}, {code:4, type:'full list'}];     $scope.update = function() {         if($scope.selectedcode == 1){             vm.purchased = "yes";         }else if($scope.selectedcode == 2){             vm.purchased = "";         }else{             vm.purchased = "no";         }         $http({             url: 'http://localhost:7200/api/manage-product',             method: 'post',             data: {userid:vm.uid, code:vm.purchased}         }).success(function(res) {         //$scope.productlist = res;         //console.log(vm.result);         vm.result = res.result;         vm.count=vm.result.length;         //console.log(vm.result);          if(vm.count == 0){             vm.showmessage = true;         } else {             vm.result=res.result;                vm.showmessage = false;          }         //console.log(vm.result);         //vm.docs=res.docs;         }, function(error) {             console.log(error);             alert('here');         });     };     $scope.update(); }