The .subscribe() method accepts 3 callbacks

Source: https://stackoverflow.com/questions/42238819/angular-2-how-to-call-a-function-after-get-a-response-from-subscribe-http-post

// The .subscribe() method accepts 3 callbacks
    .subscribe(
      // The 1st callback handles the data emitted by the observable.
      // In your case, it's the JSON data extracted from the response.
      // That's where you'll find your total property.
      (jsonData) => {
        this.send_categories(jsonData.total);
      },
      // The 2nd callback handles errors.
      (err) => console.error(err),
      // The 3rd callback handles the "complete" event.
      () => console.log("observable complete")
    );

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