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

const Immutable = require('immutable');

import * as GridActions from '../../actions/board/grid.actions';
import Values from '../Values';

const initial = [];

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

    switch (action.action) {
        case GridActions.GENERATE:
            return Values.generate(action.count, action.level);

        case GridActions.UPDATE:
            return Immutable.List(state).set(action.index, action.value).toArray();
    }

    return state;
};

export default reducer;