map<R> method

void map<R>(
  1. R transformer(
    1. T value
    ),
  2. void callback(
    1. R value
    )
)

Transform value before calling callback

Implementation

void map<R>(
    R Function(T value) transformer, void Function(R value) callback) {
  void listener() {
    final transformed = transformer(value);
    callback(transformed);
  }

  addListener(listener);
}