termFrequencies function

Map<String, int> termFrequencies(
  1. List<String> tokens
)

Term frequencies for a list of tokens (e.g. words).

Implementation

Map<String, int> termFrequencies(List<String> tokens) {
  final Map<String, int> tf = <String, int>{};
  for (final String t in tokens) {
    tf[t] = (tf[t] ?? 0) + 1;
  }
  return tf;
}