Checking links stored in an array using JavaScript

Question

Checking links stored in an array using JavaScript

I am currently working on a JavaScript function that will iterate through an array of URLs to find a 'pingable' URL and return its index. Here is the code snippet I have so far:

function ping(url: string): Promise {
  return new Promise((resolve) => {
    this.http.get(url, { observe: 'response' }).subscribe(
      (response) => {
        resolve(response.status === 200);
      },
      (error) => {
        resolve(false);
      }
    );
  });
}

I am facing a challenge with handling promises within each iteration of the loop. Any advice or guidance would be greatly appreciated.

My attempt involved using a for loop with a break statement to exit once a pingable URL was found. However, breaks are not permitted in this case.

javascript typescript promise

Answer 1

Answer №1

It may be beneficial to enhance the data returned by your function instead of just a boolean value. One approach could be to modify the function so that it accepts a URL and an index, and upon resolving or rejecting the promise, it returns an object containing both the index and the result.

interface IPingableResponse {
  index: number;
  pingable: boolean;
}

ping(url: string, idx: number): Promise<IPingableResponse> {
  return new Promise<IPingableResponse> ((resolve) => {
    this.http.get(url, {
      observe: 'response'
    }).subscribe((response) => {
      resolve({
        index: idx,
        pingable: response.status === 200
      });
    }, (error) => {
      resolve({
        index: idx,
        pingable: false
      });
    });
  });
}

Answer 2

It may be beneficial to enhance the data returned by your function instead of just a boolean value. One approach could be to modify the function so that it accepts a URL and an index, and upon resolving or rejecting the promise, it returns an object containing both the index and the result.

interface IPingableResponse {
  index: number;
  pingable: boolean;
}

ping(url: string, idx: number): Promise<IPingableResponse> {
  return new Promise<IPingableResponse> ((resolve) => {
    this.http.get(url, {
      observe: 'response'
    }).subscribe((response) => {
      resolve({
        index: idx,
        pingable: response.status === 200
      });
    }, (error) => {
      resolve({
        index: idx,
        pingable: false
      });
    });
  });
}

Checking links stored in an array using JavaScript

Answer №1

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