Dart基础语言 — symbol、enum、comments

Dart基础语言 — symbol、enum、comments

符号 Symbol

Dart语言的标识符，在反射中用的很普及，特别是很多发布包都是混淆后的。

import 'dart:mirrors';
Symbol libraryName = new Symbol('dart.core');
MirrorSystem mirrorSystem = currentMirrorSystem();
LibraryMirror libMirror = mirrorSystem.findLibrary(libraryName);
libMirror.declarations.forEach((s, d) => print('$s - $d'));

枚举 Enum

适合用在常量定义，类型比较很方便。

enum Status { none, running, stopped, paused }Status.values.forEach((it) => print('$it - index: ${it.index}'));

注释 Comments

单行注释

// Symbol libraryName = new Symbol('dart.core');

多行注释

/*
 * Symbol
 *
Symbol libraryName = new Symbol('dart.core');
MirrorSystem mirrorSystem = currentMirrorSystem();
LibraryMirror libMirror = mirrorSystem.findLibrary(libraryName);
libMirror.declarations.forEach((s, d) => print('$s - $d'));
*/

文档注释

/// `main` 函数
///
/// 符号
/// 枚举
///
void main() {
  ...
  }

PDF文档整理：

Dart基础语言学习-上篇.pdf