Unusual AngularJS error encountered while performing calculations on object properties

After running a specific calculation in my code, I encountered an unexpected issue.

if (typeof $scope.memoryTable[name][category]['total'] !== 'undefined') {
    $scope.memoryTable[name][category]['total'] = $scope.memoryTable[name][category]['total'];
}
else {
    $scope.memoryTable[name][category]['total'] = 0;
}

Initially, this code appeared to be functioning correctly with no errors. However, upon attempting a simple calculation on the same property:

if (typeof $scope.memoryTable[name][category]['total'] !== 'undefined') {
    // add 10
    $scope.memoryTable[name][category]['total'] = $scope.memoryTable[name][category]['total'] + 10;
}
else {
    $scope.memoryTable[name][category]['total'] = 0;
}

An unusual error emerged from AngularJS along with incorrect calculations resulting in unexpectedly high values being returned.

I suspect that the root cause of this issue may lie within the digest cycle mechanism.

https://i.sstatic.net/r4At7.png

javascriptangularjs

Answer №1

Utilize the $log API to determine the data type of the total property and continuously monitor other properties in a similar manner:

if ($scope.memoryTable &&
    $scope.memoryTable[name] &&
    $scope.memoryTable[name][category] &&
    $scope.memoryTable[name][category]['total'] && 
    typeof $scope.memoryTable[name][category]['total'] !== 'undefined') {

    // Verify the data type of total
    $log.log("Data type of total: " + typeof $scope.memoryTable[name][category]['total']);
    // Increment by 10
    $scope.memoryTable[name][category]['total'] += 10;
}
else {
    $scope.memoryTable[name][category]['total'] = 0;
}
// Log the value
$log.log("Value of total: " + $scope.memoryTable[name][category]['total']);

Answer №2

It seems like $scope.memoryTable or ...['total'] is being watched somewhere, leading to attempts to modify it during the $digest cycle.

var total = $scope.memoryTable[name][category]['total'];

If (typeof total !== 'undefined') {

total += 10;

} else {

total = 0;

}

$scope.memoryTable[name][category]['total'] = total;

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