Hi Martin,
A directive is not the solution. For the reasons you are giving yourself.
If you really need to 'store' the result of the calculation back in the
scope you are better of doing this in the controller, or even better in a
service. If it's 'temp' data you need just for sorting or other view issues
the controller is the best place to do it.
If you really want to do it in the view (fully knowing this is a bad idea
to start with) you can use an expression like this.
{{ asset.oldvalue !== undefined ? (asset.diff = asset.oldvalue - asset.
newvalue) : undefined }}
The better solution is to set the asset.diff at the same time you are
setting the oldvalue.
Regards
Sander
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