Flutter - Dart : wait a forEach ends

Question

I try to modify a string using data in each node I retrieve from Firebase database, and then to write a file with the modifed string (called \"content\").

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Answer 1

If you use for(... in ) instead of forEach you can use async/await

Future someMethod() async {
  ...

  for(final jsonString in response.value) {
     ...
     // cacheManager.getFile returns a Future
     cacheManager.getFile(signedurl).then((file){ 
         // Modify content
         content=content.replaceAll('test',file.path);
     });
  });
}

With forEach the calls fire away for each jsonString immediately and inside it await works, but forEach has return type void and that can't be awaited, only a Future can.