void main() { String str = "1,2,3;4,5,6;7,8,9"; List<List<int>> resultList = str.split(';').map((subStr) { return subStr.split(',').map((numStr) { return int.parse(numStr); }).toList(); }).toList(); print(resultList); } ...
split()方法接受一个分隔符作为参数,并返回一个包含分割后的字符串的列表。 以下是将列表字符串转换为列表的示例代码: 代码语言:txt 复制 String listString = "[1, 2, 3, 4, 5]"; List<String> stringList = listString.replaceAll('[', '').replaceAll(']', '').split(', '); List<int> intL...
b.abs();// 绝对值 : 3.28b.ceil();// 向上取整: 4b.floor();// 向下取整: 3b.round();// 四舍五入取整: 3b.truncate();// 去除小数部位取整: 3Stringstr = b.toString();// 转换为字符串: 3.28Stringv = b.toStringAsFixed(1);// 四舍五入,保留几位小数,返回字符串: 3.3 解析为数字 ...
Listsplit(Pattern pattern); 该pattern输入参数可以是一个String或一个RegExp对象。例如: String s1='bezkoder.earth.com';s1.split('.');// [bezkoder, earth, com]String s2='bezkoder2019.com';s2.split(RegExp(r'[0-9]+'));// [bezkoder, .com]String s3='bezkoder';s3.split('');// [...
String raws2 = r"It\'s not easy to become a developer, but worthy!"; print(raws2); // It\'s not easy to become a developer, but worthy! 1. 2. 3. 4. 5. 6. 7. 创建多行字符串 我们将使用三引号创建多行字符串: String s1 = '''bezkoder.com ...
Attempt to execute code removed by Dart AOT compiler (TFA) (crash after updating to 3.27.1 from 3.24.5) #160551 opened Dec 18, 2024 260 Unresolved conversations Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests wi...
toLowerCase()“转为小写,”toUpperCase()“转为大写。 “trim()”清除空格。”trimLeft()“清除前边的空格。”trimRight()“清除后边的空格。” split()“分割字符串。”replace(),replaceAll(‘old’,’new‘)“替换字符串。 6.创建List(数组):var list=[1,2,3]。创建不可变List:var list=const[1,2,...
{setState(() {});},),DropdownButton<SortMode>(value: _sortMode,onChanged: (value) {setState(() {_sortMode = value!;});},items: SortMode.values.map<DropdownMenuItem<SortMode>>((mode) => DropdownMenuItem(value: mode,child: Text(mode.toString().split('.').last),),).toList(...
.where((String key) => key.startsWith('assets/web')) .toList(); for (final asset in assetList) { await copyAsset(asset, folderPath); } print('移动文件耗时 = ${DateTime.now().millisecondsSinceEpoch - now}毫秒'); return '$folderPath/assets/web'; ...
split(';'); final Iterable<Text> cookieWidgets = cookieList.map((String cookie) => Text(cookie)); return Column( mainAxisAlignment: MainAxisAlignment.end, mainAxisSize: MainAxisSize.min, children: cookieWidgets.toList(), ); } } class NavigationControls extends StatelessWidget { const Navigation...