000.7 常用代码片段

dart

---

print输出被截断，可以尝试一段一段打印

void printWrapped(String text) {
  final pattern = new RegExp('.{1,800}'); // 800 is the size of each chunk
  pattern.allMatches(text).forEach((match) => print(match.group(0)));
}

枚举demo

enum TargetPlatform {
  android_arm,
  android_arm64,
  android_x64,
  android_x86,
  ios,
  darwin_x64,
  linux_x64,
  windows_x64,
  fuchsia,
  tester,
  web_javascript,
}

switch demo

// TargetPlatform 这个是枚举类型
String getNameForTargetPlatform(TargetPlatform platform) {
  switch (platform) {
    case TargetPlatform.android_arm:
      return 'android-arm';
    case TargetPlatform.android_arm64:
      return 'android-arm64';
    case TargetPlatform.android_x64:
      return 'android-x64';
    case TargetPlatform.android_x86:
      return 'android-x86';
    case TargetPlatform.ios:
      return 'ios';
    case TargetPlatform.darwin_x64:
      return 'darwin-x64';
    case TargetPlatform.linux_x64:
      return 'linux-x64';
    case TargetPlatform.windows_x64:
      return 'windows-x64';
    case TargetPlatform.fuchsia:
      return 'fuchsia';
    case TargetPlatform.tester:
      return 'flutter-tester';
    case TargetPlatform.web_javascript:
      return 'web-javascript';
  }
  assert(false);
  return null;
}

类的定义

class EngineBuildPaths {
  const EngineBuildPaths({
    @required this.targetEngine,
    @required this.hostEngine,
  }) : assert(targetEngine != null),
       assert(hostEngine != null);

  final String targetEngine;
  final String hostEngine;
}

抽象类的定义

// Manages the engine artifacts of Flutter.
abstract class Artifacts {
  static Artifacts get instance => context.get();

  static LocalEngineArtifacts getLocalEngine(String engineSrcPath, EngineBuildPaths engineBuildPaths) {
    return LocalEngineArtifacts(engineSrcPath, engineBuildPaths.targetEngine, engineBuildPaths.hostEngine);
  }

  // Returns the requested [artifact] for the [platform] and [mode] combination.
  String getArtifactPath(Artifact artifact, { TargetPlatform platform, BuildMode mode });

  // Returns which set of engine artifacts is currently used for the [platform]
  // and [mode] combination.
  String getEngineType(TargetPlatform platform, [ BuildMode mode ]);
}

Lua

---

for循环

local bugList = {}
bugList[0] = 1
bugList[1] = 2
for i= 1, #bugList do
   local bug = bugList[i];
   print(bug)
end