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import 'dart:html';
  
void main () {
  final ButtonElement button = querySelector('button');
  final InputElement input = querySelector('input');


  button.onClick
    .take(4)
    .where((event) => input.value == 'banana')
    .listen(
      (event) => print('You got it!'),
      onDone: () => print('Sorry, no luck.')
  	);
}

<h4>Guess the word!</h4>
<input /> <button>Submit</button>