在Dart-Second Level中对地图列表进行排序 [英] Sort a list of maps in Dart - Second Level Sort in Dart
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问题描述
我有一个这样的地图列表:
I have a list of maps like this:
var associations = [{'name': 'EG', 'description': 'Evil Genius'},
{'name': 'NaVi', 'description': 'Natus Vincere'}];
var members = [
{'associationName': 'EG', 'firstName': 'Bob', 'lastName': 'Dylan', 'email': 'bd@gmail.com'},
{'associationName': 'NaVi', 'firstName': 'John', 'lastName': 'Malkovich', 'email': 'jm@gmail.com'},
{'associationName': 'EG', 'firstName': 'Charles', 'lastName': 'Darwin', 'email': 'cd@gmail.com'}
];
我想编写一个代码，该代码将按姓氏，然后按名字的字母顺序对成员列表进行排序.此外，我希望能够找到其姓氏以指定字母开头的成员.例如，使用D，我们将得到Bob Dylan和Charles Darwin.我可以使用一个地图或一个列表来管理它，但是将地图列表组合起来会更加困难.
I would like to write a code that would sort the list of members alphabetically by the last name first, then by the first name. Moreover, I would like to be able to find members whose lastnames start with a specifiedd letter. By example, with D, we would get Bob Dylan and Charles Darwin. I am able to manage it with a single map or a single list, but combining a list of maps makes it more difficult.
感谢您的帮助.
推荐答案
要排序:
members.sort((m1, m2) {
var r = m1["lastName"].compareTo(m2["lastName"]);
if (r != 0) return r;
return m1["firstName"].compareTo(m2["firstName"]);
});
要过滤:
members.where((m) => m['lastName'].startsWith('D'));
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