Solving Angular's memory leakage issues

While optimizing my Angular application and researching various websites, I came across this practice:

var cleanup = $scope.$on('someEvent', function() {  
    $scope.refresh();
});
$scope.$on('$destroy', function() {
    cleanup();
});

Considering that I have multiple $scope.$on statements in my controllers, I am curious if utilizing the following approach is acceptable:

var first = $scope.$on('firstEvent', function() {  
    $scope.something1();
});
var second = $scope.$on('secondEvent', function() {  
    $scope.something2();
});
var third = $scope.$on('thirdEvent', function() {  
    $scope.something3();
});
$scope.$on('$destroy', function() {
    first();
    second();
    third();
});

Is this a recommended and proper implementation?

Answer №1

In a referenced article, it is mentioned that Angular should handle memory management automatically, but it is still recommended to take care of it manually.

Although Angular is designed to clean up memory leaks, it is advisable to be proactive in managing them yourself.

Adding unnecessary safeguards for expected framework behavior is overly cautious and may not always be considered best practice.

When using jQuery/jqLite (element.on) or third-party event listeners, it is important to ensure they are cleaned up when the scope is destroyed with $destroy or during element destruction events like element $destroy.

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