Word Count with Map - Dart Programming

Counting words is a classic map exercise: split the text, walk each word, and increment its tally in a map. Default Dart maps keep insertion order, so the summary stays stable.

Program

Play the program to tally six words and build a deterministic summary string.

word_count.dart

void main() {
  var text = 'red blue red green blue red';
  var words = text.split(' ');
  var counts = <String, int>{};
  for (var w in words) {
    counts[w] = (counts[w] ?? 0) + 1;
  }
  var entries = counts.entries;
  var parts = entries.map((e) => '${e.key}:${e.value}');
  var summary = parts.join(',');
  print(summary);
}

split `'red blue ... red'.split(' ')` returns `[red, blue, red, green, blue, red]`.

counter map `?? 0` starts unseen words at zero before the program adds one.

insertion order Walking `counts.entries` keeps insertion order, so the joined summary is deterministic.