Session.addCounter
Session.addCounter($key) -> number
Description
Increment a counter for the given key.
If the key does not yet exist, it is initialized with the value of 1.
The current counter value is returned.
Session.addCounter('numPageHits')
Session.get('numPageHits') //= 1
// ... in a later request ...
$numPageHits = Session.addCounter('numPageHits')
//= 2