angularjs - Angular $watch: TypeError: Cannot read property of undefined -

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i have $watch applies filter date format:

$scope.$watch(function() {     return pn.myobj.birthdate; },function(n,o){     var dateview = $filter('date')(pn.myobj.birthdate,'yyyy-mm-dd');     pn.myobj.birthdate = dateview; });

the first time load page read in console:

typeerror: cannot read property 'birthdate' of undefined

how can prevent problems arising in $watch when object undefined?

your object isn't initialize @ time $watch function called. check exists before attempting access 1 of it's properties.

$scope.$watch(function() {     return pn && pn.myobj && pn.myobj.birthdate; }

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