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

const Immutable = require('immutable');

import * as TitlebarActions from '../../actions/board/titlebar.actions';

const initial = '';

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

    if (action.action === TitlebarActions.UPDATE) {
        return action.text;
    }

    return state;
};

export default reducer;