random number library

Version on this page:1.1
LTS Haskell 11.10:1.1
Stackage Nightly 2018-05-22:1.1
Latest on Hackage:1.1

See all snapshots random appears in

BSD3 licensed
Maintained by carter dot schonwald at google mail dot com

Module documentation for 1.1

The Haskell Standard Library -- Random Number Generation

Build Status

This library provides a basic interface for (splittable) random number generators.

The API documentation can be found here:


A module supplying this interface is required for Haskell 98 (but not Haskell 2010). An older [version] (http://www.haskell.org/ghc/docs/latest/html/libraries/haskell98/Random.html) of this library is included with GHC in the haskell98 package. This newer version, with compatible api, is included in the [Haskell Platform] (http://www.haskell.org/platform/contents.html).

Please report bugs in the Github [issue tracker] (https://github.com/haskell/random/issues) (no longer in the GHC trac).



  • breaking change to randomIValInteger to improve RNG quality and performance see https://github.com/haskell/random/pull/4 and ghc https://ghc.haskell.org/trac/ghc/ticket/8898
  • correct documentation about generated range of Int32 sized values of type Int https://github.com/haskell/random/pull/7
  • fix memory leaks by using strict fields and strict atomicModifyIORef' https://github.com/haskell/random/pull/8 related to ghc trac tickets #7936 and #4218
  • support for base < 4.6 (which doesnt provide strict atomicModifyIORef') and integrating Travis CI support. https://github.com/haskell/random/pull/12
  • fix C type in test suite https://github.com/haskell/random/pull/9

bump for overflow bug fixes

bump for ticket 8704, build fusion

bump for bug fixes,

bumped version for float/double range bugfix

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