Data Pipeline Patterns

Filter Scores

Filtering keeps values that match a rule and drops the rest before the next stage.

Program

Play the program to keep names whose score reaches the selected minimum.

filter_scores.dart 
void main() {
  var scores = {'Ada': 92, 'Linus': 78, 'Grace': 86};
  var minScore = ;
  var passed = <String>[];
  for (var entry in scores.entries) {
    if (entry.value >= minScore) {
      passed.add(entry.key);
    }
  }
  print('passed=${passed.join(",")}');
}

void main() {
  var scores = {'Ada': 92, 'Linus': 78, 'Grace': 86};
  var minScore = ;
  var passed = <String>[];
  for (var entry in scores.entries) {
    if (entry.value >= minScore) {
      passed.add(entry.key);
    }
  }
  print('passed=${passed.join(",")}');
}
entries `scores.entries` visits each key/value pair in a map.
filter The `if` statement decides whether the current entry continues.
join `passed.join(',')` turns the kept names into display text.