Angular should be able to do that for you. For example in {{ price * quantity 
}}, if you change price or quantity, the expression would be updated 
automatically...
Is that what you were about?
One caveat is if you have really large lists, they can have a lot of watchers 
automatically set on them, so you might want to use some type of "non-watching 
list"...
There are some ready made modules available...

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