Hi all! I’m pleased to announce the first release of urn a library that implements urns, a very nifty pure functional data structure for randomly sampling with or without replacement from weighted discrete distributions in log time. It provides implementations for using ints and floats as weights, though it can be extended to any number like thing that can be uniformly sampled from.
The package is available through opam with opam install urn, and is distributed under the MIT license.