How to assign values to object that has similar keys?

Question

just wanted to avoid if statements is there way to assign values to object if they have similar keys in response instead of checking each object with if ?

what could be efficient approach here ?

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;
}

data

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

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

Possible duplicate of [How to copy matching properties from one object to another](https://stackoverflow.com/questions/36441682/how-to-copy-matching-properties-from-one-object-to-another) — Simon Groenewolt, Oct 22 '18 at 17:27

score 0 · Answer 1 · answered Oct 22 '18 at 16:47

0

Check this out: https://developer.mozilla.org/es/docs/Web/JavaScript/Referencia/Objetos_globales/Object/hasOwnProperty

You could try this approach:

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;
}

You should check more validations or conditions to make it work for you.

answered Oct 22 '18 at 16:47

Koken

102
6

Element implicitly has an 'any' type because type 'Idetails' has no index signature – hussain Oct 22 '18 at 16:54
1

Watch out: It might not be an issue but this copy is less 'deep' then the one in the question. – Simon Groenewolt Oct 22 '18 at 17:24

score 0 · Answer 2 · answered Oct 22 '18 at 18:10

If your goal is just to avoid if statements, you could rewrite it like so:

// 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'}));

How to assign values to object that has similar keys?

2 Answers2

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