A simple hash-router in a functional reactive manner. Implemented in highland.

highland-router.js

// Example for a reactive functional router implemented in highland.

var router = _.pipeline(
  _.map(e => (parse(e.newURL).hash || '#').slice(1)),
  _.map(path => routes.match(path)),
  _.map(m => m.fn(m.params)),

  // Make sure that the side-effect results are resetted.
  _.flatMap(m => _([
    {_location: window.location.hash, _view: null}
  ]).concat([m]))
);