map<S> method

Unwrap<S> map<S>(
  1. S? callback(
    1. T e
    )
)

解包构造成其他的值 callback 构造其他值的回调

Implementation

Unwrap<S> map<S>(S? Function(T e) callback) {
  final value = this.value;
  if (value == null) return Unwrap<S>(null);
  return Unwrap<S>(callback(value));
}