Subscribe to specific range of array, like A20:A100 in Excel

[IvanRave]

Wildcard paths (like foo.*) represent all changes to a given path and its subproperties, including array mutations.

Is there any possibility to subscribe to specific range of array, like subscription in Excel, for example:

computed('cells.20:100.value', sum(values))

[arthurevans]

It is not. On the other hand, you can write an observer or computing function that simply ignores changes outside that range.

For a computed binding (which accepts literal arguments) you could even add from, to arguments, so you could do something like:

<some-el some-prop="[[_computeSum(myArray, 20, 100)]]">

[IvanRave]

Angular uses watch expressions (functions) for difficult cases:
$watch(watchExpression, listener, [objectEquality]);

It allows to subscribe to any piece of data, but

The watchExpression is called on every call to $digest() and should return the value that will be watched

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.