javascript - function got undefined. Basic program -

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i new @ this. looked @ different examples still cannot figure wrong code

index.html

<html ng-app="main">     <head>         <script src="angular.min.js"></script>          <script src="app.js"></script>     </head>      <body ng-controller="maincontroller">         {{3 + 2}}     </body> </html>

app.js

(function() {      angular.module("main", [])         .controller("maincontroller", maincontroller);      var maincontroller = function($scope) {         $scope.message = "hello angular!";     }; }());

'maincontroller' got undefined because called before declare.

solution: declare 'maincontroller' before call.

(function() {   var maincontroller = function($scope) {       $scope.message = "hello angular!";   };    angular.module("main", [])     .controller("maincontroller", maincontroller); }());

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