This post covers several topics around collections (sets, lists, maps/dictionaries, queues, etc) that I’d like to see someone explore more fully. To my knowledge, there are many alternative collection libraries for Java and for many other languages, but I’m not aware of any that provide support for monotonic collections. What is a monotonic collection, I…

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Neil Madden

Explores monotonic collections as an intermediate approach between immutable and mutable data structures. Monotonic collections allow append-only operations while maintaining logical monotonicity—once a predicate is true, it remains true. This property enables simplified concurrency and distributed systems without coordination protocols (per CALM principle). Proposes a novel class hierarchy separating read-only views from mutation operations using a CQRS-like pattern, with ImmutableList extending MonotonicList extending List, paired with separate ListAppender and ListUpdater interfaces for modifications.

Monotonic Collections: a middle ground between immutable and fully mutable