CODEWITHSUNDEEP
jsonangular
André Costa
André Costa

Reputation: 59

Angular 4 find JSON data

I have this JSON: (this.url)

    {
    "user": [
        {
            "id": "1",
            "name": "root",
            "password": "root"
        },
        {
            "id": "2",
            "name": "clienttest",
            "password": "123456"
        }
    ]
}

and I have this service:

 findUsers(id: number) : boolean {
    return this.http.get(this.url)
    .map((res: Response) => res.json());
    .someOperator(to assert the id exist)...
  }

I want to return true if the user was found. Is there some operator like filter that can make this assert for me?

Upvotes: 1

Views: 579

Answers (1)

Andriy
Andriy

Reputation: 15442

try to use Array.some() method:

findUsers(id: number) : boolean {
  return this.http
             .get(this.url)
             .map((res: Response) => {
               let result = res.json();
               return result.user.some(user => parseInt(user.id) === id)
             })
}

Inline simulation: 

const data = {
  "user": [
    {
      "id": "1",
      "name": "root",
      "password": "root"
    },
    {
      "id": "2",
      "name": "clienttest",
      "password": "123456"
    }
  ]
}

// this will simulate http get resolve being processed by res.json()
const httpGet = Rx.Observable.of(data);

const findUsers = id => 
  httpGet.map(data => data.user.some(user => parseInt(user.id) === id))
;

findUsers(1).subscribe(result => console.log(result));
findUsers(3).subscribe(result => console.log(result));
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/5.5.5/Rx.min.js"></script>

Upvotes: 1

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