You have two $scope.cleaner functions

[Mae Capozzi]

calculator-/js/script.js

Lines 132 to 135 in a636cc8

 $scope.cleaner = function() { 
   $scope.resultNumber = 0; 
   $scope.display = []; 
 } 

Not sure how this can work! Make sure you need both, and if you do, rename one of them.