如何为具有相似键的对象分配值？

Question

只是想避免if语句在响应中具有相似键的情况下将值分配给对象，而不是用if检查每个对象？

在这里什么是有效的方法？

main.ts

  public responsehandler(@Body()data: any): any {
        const response: Idetails = {} as Idetails;
        if (data.details === undefined || data.details === null) {
           return data;
        }
        if (data.details) {
            if (data.details.primary) {
                response.details.primary.beginningBalance = data.details.primary.beginningBalance;
                response.details.primary.endingBalance = data.details.primary.endingBalance;
            }

            if (data.details.secondary) {
                response.details.secondary.beginningBalance = data.details.secondary.beginningBalance;
                response.details.secondary.endingBalance = data.details.secondary.endingBalance;

            }

        }
        return response;
    }

interface.ts

export interface Idetails {
 primary:balanceDetails;
 secondary: balanceDetails;
}

export interface balanceDetails {
     beginningBalance: string;
     endingBalance: string;
}

数据

details: {
 primary: {
   beginningBalance: 458,
   endingBalance: 890
 }, 

 secondary: {
   beginningBalance: 47,
   endingBalance: 871
 }
}

Answer 1

检查一下： https : //developer.mozilla.org/es/docs/Web/JavaScript/Referencia/Objetos_globales/Object/hasOwnProperty

您可以尝试这种方法：

public responsehandler(@Body()data: any): any {
    const response: Idetails = {} as Idetails;
    if (!data.details) {
         return data;
    }

    for (const key in response.details) {
            if (data.details.hasOwnProperty(key)) {
                    response.details[key] = data.details[key];
            }
    }

    return response;
}

您应该检查更多验证或条件，以使其适合您。

Answer 2

如果您的目标只是避免if语句，则可以这样重写它：

 // in js (sorry not a ts user) function responseHandler(data) { return data.details == null ? data : {details: {...data.details}}; } console.log(responseHandler({details: {primary: {beginningBalance: 0, endingBalance: 1}}})); console.log(responseHandler({details: {secondary: {beginningBalance: 0, endingBalance: 1}}})); console.log(responseHandler({noDetails: 'oopsy'}));