// 定义固定类型的数组varlist=List<int>();print('$list - length: ${list.length}');// 输出 [] - 0 2、定义固定长度数组 varlist2=List(2);print('$list2');// [null, null] 3、定义混合类型数组 varlist3=List<dynamic>();list3.add(2);list3.add('value');print(list3);// [2, ...
List<int> squaredNumbers = numbers.map((number) => number * number).toList(); print('原始数字列表:$numbers'); print('每个数字的平方列表:$squaredNumbers'); 1. 2. 3. 4. 5. map方法就像是 List 的魔法师,可以将每个元素进行转换,创造出一个全新的 List。 使用where过滤 List 中的元素 List<...
一,初始化List 非固定长度list var testList = List(); print(testList.length);//输出0 固定长度List var testList2 = List(2); print(testList2.length);//输出2 元素类型固定: var testList3 = List<String>(); testList3.add("哈哈哈"); //testList3.add(1);//报错,1不是String类型 直接...
List<String>fruits=['apple','banana','orange'];String firstFruit=fruits[0];print('盒子里的第一样东西是什么呢?是:$firstFruit');// 输出:盒子里的第一样东西是什么呢?是:apple 哎呀,索引就像是盒子的小抽屉,从 0 开始,想拿出哪个就说出它的位置,比如fruits[0]就是拿出第一个水果。 往盒子里加新...
void listDemo() { // 1.list的创建 listCreate(); // 2.多种类型的输出 listPrint(); // 3.添加数据 listAddElement(); // 4.删除数据 listRemoveElement(); // 5.更改列表元素 changeTheListElements(); // 按顺序迭代列表 List<String> names = ["Alice", "Daphne", "Elizabeth", "Joanna"...
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(response.body);newsListBean=NewsListBean(jsonRes);if(lastID=='0'&&rowNum==0&&dataItems!=null){dataItems.clear();}setState((){if(newsListBean!=null&&newsListBean.list!=null&&newsListBean.list.length>0){for(int i=0;i<newsListBean.list.length;i++){dataItems.add(newsListBean.list[...
Revert "Add no-shuffle to reorderable_list_test.dart" by @dnfield in #137715 Ticker should dispatch creation and disposal events. by @ksokolovskyi in #137844 Add support for color and color blendmode in FadeInImage by @prasadsunny1 in #137681 Document additional cases by @dnfield in #13...
"Comma separated list of timeline streams to record. " "Valid values: all, API, Compiler, CompilerVerbose, Dart, " "Debugger, Embedder, GC, Isolate, and VM."); // 展开后: charp FLAG_timeline_streams = Flags::Register_charp(&FLAG_timeline_streams, 'timeline_streams', NULL, "Comma sep...
SendPort sendPort = await receivePort.first; // 调用sendReceive自定义方法 List dataList = await sendReceive(sendPort, 'https://hicc.me/posts'); print('dataList $dataList'); } // isolate的绑定方法 static dataLoader(SendPort sendPort) async{ ...