Dart语言入门指南

1. 基本语法

void printInteger(int aNumber) {  print('The number is $aNumber.');}

void main() {  var number = 42;  printInteger(number);}

int? lineCount;

void main() {  late String description = 'Feijoada!';  print(description);}

常用内置数据类型包括：int、double、String、bool、List（数组）、Set、Map、Runes（UTF-32字符集）。

runesDemo() {  Runes runes = new Runes('\u2665, \u{1f605}, \u{1f60e}');  print(runes);  print(new String.fromCharCodes(runes));}

var list = [1, 2, 3];

enableFlags(paramName: value, hidden: false);

void printElement(int element) {  print(element);}

var list = [1, 2, 3];list.forEach(printElement);

condition ? expr1 : expr2

expr1 ?? expr2

class Point {  double x = 0;  double y = 0;  Point(this.x, this.y);}

class MyMixin {  void method() {}}

class MyClass extends Object with MyMixin {}

var paint = Paint()  ..color = Colors.black  ..strokeCap = StrokeCap.round  ..strokeWidth = 5.0;

Future
   
     future = someAsyncFunction();

void someAsyncFunction() async {  // 异步操作逻辑}

通过以上内容，可以快速入门 Dart语言的基础知识和实践应用。

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