Reducers

[spoike]

Adds createReducer function for creating a data store that uses pure functions to alter it's state. Much like the reduce function in lodash/underscore.

Usage:

var addUser = Reflux.createAction({ sync: true });
var reducer = Reflux.createReducer({ users: [] });

reducer.on(addUser, function(data, newUser) {
  data.users.push(newUser);
  return data;
})

addUser("John Doe");
reducer.peek(); // outputs { users: ["John Doe"] }

Todo:

• Either implement getInitialState or let react mixins look at the peek function instead.
• Should I add an unsubscribe function?