//! adapted for mithril from flyd https://github.com/paldepind/flyd
'use strict'

var combine = require('../stream').combine

module.exports = function (reducer, seed, stream) {
   var newStream = combine(function (s) {
    return seed = reducer(seed, s._state.value)
  }, [stream])

  if (newStream._state.state === 0) newStream(seed)

  return newStream
}