bloom-filters
JS implementation of probabilistic data structures: Bloom Filter (and its derived), HyperLogLog, Count-Min Sketch, Top-K and MinHash
@thi.ng/lsys
Functional, extensible L-System architecture w/ support for probabilistic rules
skipstruct
Set of efficient data structures based on skip lists.
hyperlolo
Efficiently estimate the cardinality of a set in Typescript and Javascript
shuffrand
Cryptographically secure randomness and shuffling — with soul.