javascript - How to copy object and create new object with existing Json object? -

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i trying create new object have default values scope.

i found there copy function create new independent object.

angular.copy(source,destication)

but not working me. undefined when console new object.

angular.copy($rootscope.answers,$rootscope.default); console.log($rootscope.answers); console.log($rootscope.default);

https://plnkr.co/edit/bfgxr7lnae0kvqipj9jj?p=preview

in app.js in .run method trying use copy function. please let me know if missing anything.

cloning option. below example: 

var deepclonedcopy = jquery.extend(true, {}, originaldata); var cloneddata; cloneddata= $.map(deepclonedcopy, function(el) { return el });

see article detailed explanation: http://heyjavascript.com/4-creative-ways-to-clone-objects/

additional answer added:

you need define $rootscope.default={}; before performing copy.

$rootscope.default={}; angular.copy($rootscope.answers,$rootscope.default); console.log($rootscope.answers); console.log($rootscope.default);

see updated plnkr : https://plnkr.co/edit/hef6ushyfroxs33kras8?p=preview

alternatively can too:

$rootscope.default = angular.copy($rootscope.answers);

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