Call function into another function with in the same Controller Angular Js

Question

I am new to using angularjs and i have declared a two functions in controller, and now i want to use one function into another function how can i do that means if i say function name into another function it says Undefined.

here is the code:

'use strict';
angular.module('customer').controller('Controller', ['$scope', '$state', 'Sservice',
  function($scope, $state, Sservice) {

    var that = this;

    (function getDetails() {
        //IMPLEMENTATION
    }());

    this.function2 = function function2 (id){
        //implementation
      getDetails(); // says undefined
    };
  }
]);

Answer 1

.controller('SampleController',function($scope){
$scope.funcA = function(){
   $scope.funcB();//scope level function
   funcC(); //non scope level function``
}
$scope.funcB = function(){
}
var funcC = function(){
}
});

Answer 2

.controller('SampleController',function($scope){
$scope.funcA = function(){
   $scope.funcB();//scope level function
   funcC(); //non scope level function``
}
$scope.funcB = function(){
}
var funcC = function(){
}
});