Is there a difference in performance when adding objects to $scope.array compared to using var x = [ ] in AngularJS?

When it comes to tasks like this, I find myself needing to handle situations like the following:

$scope.my_array = [];
var obj;

for (var i = 0; i < data.length; i++) {
    obj = {};
    obj.item1 = data.something;
    obj.item2 = data.somethingElse;
    $scope.my_array.push(obj);
}

Would it be more efficient to do this instead:

var my_array = [];
var obj;

for (var i = 0; i < data.length; i++) {
    obj = {};
    obj.item1 = data.something;
    obj.item2 = data.somethingElse;
    my_array.push(obj);
}

$scope.my_array = my_array;

I suspect that in the first version, the digest cycle may run every time an object is added to the array, unlike in the second version. Can you confirm if this is correct? Essentially, what would be the optimal way to approach the task mentioned above?

Answer №1

Indeed, there is a solution specifically for IE8.

The $scope object functions differently from a regular JavaScript object as it looks in the parent scope when properties are not found. This suggests that there are additional internal mechanisms at play within $scope.

I encountered a similar issue and saw improved performance on IE8 (loading time reduced from 5 seconds to just 1 second) when handling some data outside of the $scope object. This may be due to how the $scope object is structured.

Although I am certain that the digest cycle does not trigger with every change, there may still be some internal processes occurring each time a value is modified.

Interestingly, this performance discrepancy was only noticeable in IE8. It's possible that the $scope object relies on a mechanism like a native JavaScript Linked List, which could explain its poor performance in IE8.

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