react-redux – 在减速机中改变状态有什么后果？

We don’t mutate the state. We create a copy with Object.assign(). Object.assign(state,{ visibilityFilter: action.filter }) is also wrong: it will mutate the first argument. You must supply an empty object as the first parameter. You can also enable the object spread operator proposal to write { …state,…newState } instead.

我碰巧写了下面的代码片段：

[actions.setSelection](state,{payload}) {
    state[payload.key] = payload.value;
    return state;
},

我对此感到不满,并重新审视了智慧指南.我已经重写了这个：

[actions.setSelection](state,{payload}) {
    const result = Object.assign({},state);
    result[payload.key] = payload.value;
    return result;
},

我很确定我在我的代码的其他地方冒犯了上面提到的诫命.如果我没有勤奋地跟踪他们,我会看到什么样的后果？

(注意：上面的reducer语法是通过redux-actions.否则它将是reducer fn switch / case中的代码块.)