Last changing value from a spread


#1

Hello,
I have a spread of two values moving separately, I need to access both values but when they move more or less at the same time I want just the one that moved for last.
I thought about CAR and CDR but they work just for index while I need to monitor the whole spread. There’s a node I’m missing or a smart way for doing this?
Thanks


#2

have a look at change and select.