How to deep watch an array in angularjs?

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You can set the 3rd argument of $watch to true:

$scope.$watch('data', function (newVal, oldVal) { /*...*/ }, true);

See https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$watch

Since Angular 1.1.x you can also use $watchCollection to watch shallow watch (just the “first level” of) the collection.

$scope.$watchCollection('data', function (newVal, oldVal) { /*...*/ });

See https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$watchCollection

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