Retrieve a particular attribute from the response data using Typescript

Here is an example of the response data format:

In a Typescript environment, how can I extract the value of the "_Name" property from the first item inside the "ResultList" array of the response data?

By utilizing this.responseData$.subscribe(val => console.log(val));, I am able to view the response data in the browser.



ResultList: Array(1)
0: {
_CodeID: "112344", 
_Name: "ABCGDJFJFJF", // I want to access this specific property value
_IsADV: false
}
length: 1
__proto__: Array(0)
_Acknowledge: 2
_Bild: "5256"
_CId: "641645DF-E5E5-481A-B8E7-94FE2DRFFFFF"
_MachineName: "*******"
_Message: ""
_ReservationExpires: ""
_RId: ""
_RowsAffected: 0
_Version: "1.0"
javascriptarraystypescriptrxjs

Answer №1

The way you handle this variable depends on how you intend to use it later on. One approach is to simply extract it within the subscribe block:

this.responseData$.subscribe(val => {
  const necessaryInfo = val.ResultList[0]._Name;
  // manipulate the variable necessaryInfo here
});

Alternatively, you can pass it to another observable using piping:

const necessaryInfoObservable: Observable<string> = this.responseData$.pipe(map(val => val.ResultList[0]._Name));

For more information on piping and mapping, refer to: https://www.learnrxjs.io/learn-rxjs/operators/transformation/map

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