python for i in range(1, 201):
string = ""
if i % 3 == 0:
string += "Fizz"
if i % 5 == 0:
string += "Buzz"
if i % 7 == 0:
string += "Puzz"
if not string:
string = i
print(string)
Flutter $ flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, v1.12.13+hotfix.9, on Mac OS X 10.15.4 19E266, locale ja-JP) [✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3) [✓] Xcode - develop for iOS and macOS (Xcode 11.4) [✓] Android Studio (version 3.6) [✓] Connected device (1 available) • No issues found!
$ vi ~/.bash_profile
Flutter void misbehave(){
try{
dynamic foo = true;
print(foo++); //runtime error
}catch(e){
print('misbehave() partially handled ${e.runtimeType}.');
rethrow;//呼び出しもとで例外を見れるようにする
}
}
void main(){
print('start');
try{
misbehave();
}catch(e){
print('main() finished handling ${e.runtimeType}.');
}
}
Flutter void main(){
//..年齢計算用の良いコード例
int age1 = 50;
checkAge(age1);
//..年齢計算用の良いコード例
//..年齢計算用の悪い(112歳以上)コード例
int age2 = 150;
checkAge(age2);
//..年齢計算用の悪い(112歳以上)コード例
}
void checkAge(int age){
assert(age < 112, "bad age ${age}");
}
Flutter class Logger{
void log(dynamic v){
print(DateTime.now().toString() + ' ' + v);
}
}
main(){
//method cascades 未使用
new Logger().log('program started');
new Logger().log('doing something');
new Logger().log('program finished');
//method cascades使用
new Logger()
..log('program started')
..log('doing something')
..log('program finished');
}
Flutter main(){
var sunrise = '\u{1f305}';
print(sunrise);
}
Flutter Error compiling to JavaScript:
main.dart:13:1:
Error: The return type can't be 'var'.
var multiplyMethod2(int a, int b){
^^^
Error: Compilation failed.
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