Navigating a JSON object with TypeScript in Angular 2: A Step-by-Step Guide

I'm relatively new to Angular2 and I am currently grappling with looping through a JSON object retrieved from a GET request.

Here's the JSON object in question:

{
    Results: [{
        Time: "2017-02-11T08:15:01.000+00:00",
        Id: "data-mopdsjkajskda",
        AuthorId: "58fSDNJD"
    }, {
        Time: "2017-03-11T06:23:34.000+00:00",
        Id: "data-2371212hjb1",
        AuthorId: "43555HHHJ"
    }, {
        Time: "2017-04-11T07:05:11.000+00:00",
        Id: "data-kjskdha22112",
        AuthorId: "XDSJKJSDH"
    }]
}

An excerpt from my Angular code snippet:

interface res {
    Time: string;
    Id: string;
    AuthorId: string;
}
export class AppComponent {
    results: res;
    constructor(private _httpservice: HTTPService) {}
    this._httpservice.getQuery().subscribe(
        data => {
            this.results = data.Results
        },
        error => console.log(error),
        () => console.log('Done')
    );
}

Though I have successfully received the data, I aim to extract the Ids and store them in an array. In traditional Javascript, I would typically accomplish this as follows:

var ids = [];

for (i = 0; i < data.Results.length; i++) {
    ids.push(data.Results[i].Id)
}

After pushing the Ids into the array, it will look like this:

ids = ['data-mopdsjkajskda', 'data-2371212hjb1', 'data-kjskdha22112'];

However, I find myself struggling to replicate this functionality in Angular2. Any assistance on this matter would be highly appreciated!

Answer №1

If the JSON object obtained from your GET request corresponds to the structure you provided, you can achieve the desired result by executing the following code:

const idList: string[] = [];

json.Results.forEach(result => {
    idList.push(result.Id);
});

Is there anything else that is hindering you from implementing it in this manner?

Answer №2

One of the new features introduced in ECMAScript 6 is the let statement, which can be utilized within a for loop.

let idsArray:string = [];

for(let item of this.data){
   idsArray.push(item.Id);
}

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