How to implement call back function in Dart

What you are going to learn: How to implement a call-back function to get back data from the delegate class in three steps.

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call back function in dart

Step: 1- Take function as a parameter

void downloadProgress({Function(int) callback}) {
..............
..............
}

Step: 2- Set data to function, the data which have to send back from the delegate class

if(callback!=null)callback(progress);

Step: 3- Pass function in parameters from calling class.

dataProcessor.downloadProgress(callback: (int progress) {
  print('download progress : $progress');
});

Here is the complete code:

Download complete source code from Github:

link

https://github.com/codinghivedev/callback_function_in_dart

codinghivedev/callback_function_in_dart

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