getAsList<T> method

List<T> getAsList<T>(
  1. K key, [
  2. List<T>? orElse
])

Retrieves the element of key of type List from Map.

If Map has no element of key, or if the type does not match List<T>, or if Map is itself Null, orElse is returned.

MapからList型のkeyの要素を取得します。

Mapにkeyの要素がない場合やList<T>と型が合わない場合、自身がNullの場合はorElseが返されます。

Implementation

List<T> getAsList<T>(K key, [List<T>? orElse]) {
  assert(key != null, "The key is empty.");
  if (this == null || !containsKey(key) || this![key] is! List?) {
    return orElse ?? [];
  }
  return (this![key] as List?)?.cast<T>() ?? orElse ?? [];
}