|id||The id of the priority queue to use.|
Returns: Real or String
This function will return the value that has the lowest priority
in the queue and then remove the value (and priority) from the data
structure. If more than one value has the same priority, the one
that was added to the priority queue first will be the one to get
removed, but all other values with the same priority will still be
in the queue.
The above code checks an instance variable and if it returns true it will execute a script indexed in the priority queue with the lowest priority value and then remove that script from the queue.