那些你不知道的Dart细节之泛型和库（六）

var names = List<String>();
print(names is List<String>);//true
print(names.runtimeType); // List<String> 

import "dart:math";
void main() {
  print(sqrt(4));//开平方 2.0
}

dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^0.1.0
  dio: ^2.1.0

import "package:dio/dio.dart";
void main() {
  getHttp();
}
void getHttp() async {
  try {
    Response response = await Dio().get("https://www.baidu.com");
    print(response);
  } catch (e) {
    print(e);
  }
}

import 'MyLib1.dart' as lib1; 
import 'MyLib2.dart' as lib2; 
void main() {
  var myLib = lib1.MyLib();
  var myLib2 = lib2.MyLib();
}

import 'Mylib1.dart' as lib1 show Test;
import 'Mylib2.dart' as lib2 hide Test;
var test = lib1.Test();
var lib = lib2.MyLib();

import 'MyLib1.dart' deferred as lazyLib;
void main() {
  lazyLoad();
}
lazyLoad() async {
  await lazyLib.loadLibrary();
  var t = lazyLib.Test();
  t.test();
}

library mylib;
part 'util.dart';
part 'tool.dart';
void printMyLib() => print('mylib');

part of mylib;
void printTool() => print('tool');

part of mylib;
void printUtil() => print('util');

import 'mylib/mylib.dart';
void main() {
  printMyLib();
  printUtil();
  printTool();
}