Question 194571 in Flutter Question posted in
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Flutter – Expected to find ) for map function as iterable

I’m getting an error in dart when I use the map function as iterable.

Future _addPostMedia() {
debugLog('Adding post media');

return Future.wait(_data.remainingCompressedMediaToUpload
.map(_uploadPostMediaItem as Function(File e)) as Iterable<Future>
.toList());}

Above I’m getting an error Expected to find ) just before the
.toList()

This was the original code which wasn’t working and VSCode recommend some fixes :

Future _compressPostMedia() {
debugLog(‘Compressing post media’);

return Future.wait(
    _data.remainingMediaToCompress.map(_compressPostMediaItem)
    .toList());}
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Based on discussions with @Cstark, the following steps is what made the error disappear:

    Attempted:

    Future _addPostMedia() {   debugLog('Adding post media');

  return Future.wait(
    _data.remainingCompressedMediaToUpload.map(
      (_uploadPostMediaItem as Function(File e)) as List<Future>));}

    Vscode suggested a cast as a quick fix and the following is the final code:

    Future _addPostMedia() {
  debugLog('Adding post media');

  return Future.wait(
    _data.remainingCompressedMediaToUpload.map(
      (_uploadPostMediaItem as Function(File e)) as Future<Object?> Function(File e))
  );
}


  2. 0

    Each level of casting needs to wrapped in its set of parenthesis, so you were missing a set wrapping the as Iterable.

    Future _addPostMedia() {
  debugLog('Adding post media');

  return Future.wait(
    _data.remainingCompressedMediaToUpload.map(
      (_uploadPostMediaItem as Function(File e)) as Iterable<Future>
    ).toList()
  );
}
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