AngularJS | angular.isDefined() Function

The angular.isDefined() function in AngularJS is used to determine the value inside isDefined function is defined or not. It returns true if the reference is a defined otherwise returns false.

Syntax:

angular.isDefined( value )

Return Value: It returns true if the passed value is defined otherwise returns false.

Example: This example uses angular.isDefined() function to determine the value inside isDefined function is defined or not.

<!DOCTYPE html> 
<html> 
    <head> 
        <title>angular.isDefined()</title> 
          
        <script src= 
"//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"> 
        </script> 
    </head> 
  
    <body ng-app="app" style="text-align:center"> 
        <h1 style="color:green">GeeksforGeeks</h1> 
        <h2>angular.isDefined()</h2> 
          
        <div ng-controller="geek"> 
            <b>Date:</b> {{date}}<br><br> 
            {{isDefined}} 
        </div> 
          
        <!-- Script to uses angular.isDefined() function -->
        <script> 
            var app = angular.module("app", []); 
            app.controller('geek', ['$scope', function ($scope) { 
            $scope.date; 
              
            $scope.isDefined = angular.isDefined($scope.date) 
                    == true ? "$scope.date is defined." 
                    : "$scope.date is undefined."; 
            }]); 
        </script> 
    </body> 
</html>                     

Output:

Date not Defined:
If Date is defined and its value is “2019-04-07T23:46:20.586”:

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