List、Set

List：有序、可重复

Set：无序、不重复

互相转化

List list = [1, 2, 1];
Set set = list.toSet();
List sList = set.toList();

遍历forEach

List list = [1, 2, 1];
list.forEach((e) {
    print(e);
});

映射map

List list = [1, 2, 1];
List m = list.map((e) => ++e).toList();

过滤where

List list = [1, 2, 1];
List m = list.where((e) => e > 1).toList();

任一满足any

List list = [1, 2, 1];
bool b = list.any((e) => e == 2);

全部满足every

List list = [1, 2, 1];
bool b = list.every((e) => e > 0);

 Map

获取所有键keys

获取所有值values

映射map

遍历forEach

Map person = {
    "name": "Lily",
    "age": 12,
  };
  person.forEach((key, value) {
    print("$key: $value");
  });