map<U> method

Option<U> map<U>(U mapFn(T))

Maps this Option<T> to an Option<U> using the given function with the held value.

Returns:

• Some<U> if this Option is Some<T>.
• None<U> if this Option is None.

See also: Rust: Option::map()

Implementation

Option<U> map<U>(U Function(T) mapFn) {
  return switch (this) {
    Some(:T v) => Some(mapFn(v)),
    None() => None(),
  };
}