Javascript对象：如何使一个键的值成为另一个键（而不是键的值）？

Question

Is there a way to programmatically set the value of a key to another key? eg

 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; } 

The goal is for this to return an object where each key, value pair is like so:

namespace: state.city.namespace

What I am actually getting is the VALUE of the state.city.namespace key:

namespace: 'DIskieisSi98s8sjw'.

Thanks in advance for your help!

EDIT -- ADDING ADDITIONAL CONTEXT

@mem035 I probably should have added this context. I am trying create a function that will enable me to stop having to type out the mapStateToProps for Redux. For the above example, here is the 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 }; }; 

When the value becomes a string none of the properties are mapping/working.

Answer 1

Just stringify your result instead of again accessing the object.

Instead of:

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

Use:

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