This reminds me of something that was on HN a while ago: something about how they made functions immutable, and the whole programming model came from that?? And

This reminds me of something that was on HN a while ago: something about how they made functions immutable, and the whole programming model came from that?? And then this gave rise to a bunch of packages with references, and a new way of thinking about dependencies... Does someone remember something like this?