Method running before previous method is finished, Future Async Dart

Question

My method processData() is executing before pullAllData() is finished but I need processData() to wait until pullAllData() is completely finished before running. This is causing my isDownloadSuccessful bool to be Null when processData() is ran.

Future getCoinData() async {
    calculateNumberOfDataPoints();
    pullTimesAndPrices();
    return timesAndPrices;
  }

Future pullTimesAndPrices() async {
    for (String cryptoCurrency in cryptoAbbreviation) {
      pullAllData(cryptoCurrency);
      processData(cryptoCurrency);
    }
  }

Future pullAllData(cryptoCurrency) async {
    String historicalRequestURL =
        '$cryptoAPIURL$cryptoCurrency$currency/ohlc?periods=$periodValue&apikey=$apiKey';
    http.Response historicalResponse = await http.get(historicalRequestURL);
    isPullSuccessful = (historicalResponse.statusCode == 200);
  }

void processData(cryptoCurrency) {
    if (isPullSuccessful) {
      ...
    } else {
      throw 'Problem pulling data';
    }
  }

MendelG · Accepted Answer · 2021-01-14 23:06:57Z

1

You are marking your function pullTimesAndPrices as async but not using await. Use the await keyword before calling the pullAllData function.

edited Jan 14, 2021 at 23:06

MendelG

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answered Jan 14, 2021 at 22:44

pasty

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1 Comment

CuriousCoder Over a year ago

Awesome thank you! I changed my code to Future<void> pullTimesAndPrices() async { for (String cryptoCurrency in cryptoAbbreviation) { await pullAllData(cryptoCurrency); processData(cryptoCurrency); } }

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