如何从字符串列表中获取地图对象列表 dart

Question

我有以下电话号码列表：

listofnumbers = ['01225','03933']

以及地图对象列表：

 List mapofobjects = [
      {
        'name': 'John Doe',
        'phone': {
          'numbers': ['03323', '02333'], 
          'verified': true
        },
        'uid': '2BDNDD',
        'createdat': 'today..'
      },
      {
        'name': 'Mary Doe',
        'phone': {
          'numbers': ['03933', '39939'], // matches 03933 in listofnumbers
          'verified': true
        },
        'uid': '1BDNDD',
        'createdat': 'today..'
      },
      {
        'name': 'Vincin Doe',
        'phone': {
          'numbers': ['01225', '59939'], // matches 01225 in listofnumbers
          'verified': true
        },
        'uid': 'XBDNDD',
        'createdat': 'today..'
      }
    ];

如何使用每个 listofnumbers 项作为连接将 listofnumbers 转换为地图对象列表。

我应该为两个数字的 listofnumbers 得到这样的东西：

finalList =  List mapofobjects = [
      {
        'name': 'John Doe',
        'phone': {
          'numbers': ['03323', '02333'],
          'verified': true
        },
        'uid': '1BDNDD',
        'createdat': 'today..'
      },
      {
        'name': 'Vincin Doe',
        'phone': {
          'numbers': ['01225', '59939'],
          'verified': true
        },
        'uid': 'XBDNDD',
        'createdat': 'today..'
      }
    ];

当 phone['numbers'] 包含项目时，每个对象匹配/替换项目的列表。

Answer 1

您可以使用两个forEach来获得此结果，如下所示：

    List finallist = [];

    listofnumbers.forEach((element) {
      mapofobjects.forEach((e) => {
            if (e['phone']['numbers'].contains(element))
              finallist.add(e)
          });
    });
   print(finallist.length.toString());

结果是： 2

Answer 2

你可以这样做：

final finalList = [
  ...mapofobjects.where((dynamic object) =>
      object['phone']['numbers'].any((phone) => listofnumbers.contains(phone)))
];

finalList.forEach(print);
// {name: Mary Doe, phone: {numbers: [03933, 39939], verified: true}, uid: 1BDNDD, createdat: today..}
// {name: Vincin Doe, phone: {numbers: [01225, 59939], verified: true}, uid: XBDNDD, createdat: today..}