number-munchers/reducers/board/message.reducer.js

const Immutable = require('immutable');

import * as MessageActions from '../../actions/board/message.actions';

const initial = { message: '', hidden: true };

const reducer = (state = initial, action) => {
    if (action.type !== MessageActions.MESSAGE_ACTION) {
        return state;
    }

    switch (action.action) {
        case MessageActions.SHOW:
            return Immutable.Map(state)
                .set('hidden', false)
                .set('message', action.message)
                .toObject();

        case MessageActions.HIDE:
            return Immutable.Map(state)
                .set('hidden', true)
                .toObject();
    }

    return state;
};

export default reducer;