JavaScript 对象 : How do I make the value of a key be another key (not the key's value)?

Question

有没有办法以编程方式将一个键的值设置为另一个键？例如

export function getObjectForMapStateToProps(state, reducer) {
    let stateObject = {};
    for (let key in state[reducer]) {
        if (state[reducer].hasOwnProperty(key)) {
            stateObject[key] = state[reducer][key];
        }
    }
    return stateObject;
}

目标是返回一个对象，其中每个键、值对如下所示:

namespace: state.city.namespace

我实际上得到的是 state.city.namespace 键的值:

namespace: 'DIskieisSi98s8sjw'.

预先感谢您的帮助!

编辑——添加额外的上下文

@mem035 我可能应该添加这个上下文。我正在尝试创建一个函数，使我不必再为 Redux 键入 mapStateToProps。对于上面的例子，这是 map :

const mapStateToProps = state => {
    console.log(getObjectForMapStateToProps(state, 'city'));
    return {
        namespace: state.city.namespace,
        componentId: state.city.componentId,
        items: state.city.items,
        defaultValue: state.city.defaultValue,
        selectItem: state.city.selectItem,
        allowAdd: state.city.allowAdd,
        validationRegEx: state.city.validationRegEx,
        regExDescription: state.city.regExDescription,
        hasForeignKey: state.city.hasForeignKey,
        foreignKeyModel: state.city.foreignKeyModel,
        foreignKeyValue: state.city.foreignKeyValue,
        errorMessages: state.city.errorMessages,
        isError: state.city.isError,
        isLoading: state.city.isLoading,
        apiRoute: state.city.apiRoute
    };
};

当值变成字符串时，所有属性都不会映射/工作。

Answer 1

只需将结果字符串化，而不是再次访问对象。

而不是:

stateObject[key] = state[reducer][key];

用途:

stateObject[key] = `state.${reducer}.${key}`;