一.首先测试下，官方案例

迭代器的方法，有点不常见。有点像个指针，迭代完还自带break.

oid AWXTArrayActor::WXLoopArray()
{FString JoinedStr1;FString JoinedStr2;TArray<FString> StrArr = { "Hello","Baby","Fuck" };for (auto& Str : StrArr){JoinedStr1 += Str;JoinedStr1 += TEXT(" ");}// JoinedStr == "Hello Brave World of Tomorrow !"for (auto Str : StrArr){JoinedStr2 += Str;JoinedStr2 += TEXT(" ");}
}void AWXTArrayActor::WXLoopArray2()
{FString JoinedStr;TArray<FString> StrArr = { "Hello","Baby","Fuck" };for (int32 Index = 0; Index != StrArr.Num(); ++Index) //{JoinedStr += StrArr[Index];JoinedStr += TEXT(" ");}
}void AWXTArrayActor::WXLoopArray3()
{FString JoinedStr;TArray<FString> StrArr = { "Hello","Baby","Fuck" };for (auto It = StrArr.CreateConstIterator(); It; ++It)  //It指向数组的首元素，这个地址。最后指向数组后一个0,跳出循环{JoinedStr += *It;JoinedStr += TEXT(" ");}}

二. 可能导致的错误用法，将某个元素替换

void AWXTArrayActor::WXLoopArray_Error()
{FString JoinedStr;TArray<FString> StrArr = { "Hello","Baby","of","Fuck"};for (int32 Index = 0; Index != StrArr.Num(); ++Index) //{if (TEXT("of") == StrArr[Index]){StrArr.RemoveAt(Index);  //Remove}else{JoinedStr += StrArr[Index];JoinedStr += TEXT(" ");}}
}

注意一定要分帧执行
WebSocket通信过程去创建WebSocket,要下一帧执行。 类似WXLoopArray_Error()，容器不要在遍历的时候去删。

这种错误，是因为容器在RemoveAt的时候，已经将容器内部进行了，位置的前移这种操作。你不能默认它没有移动。

三.解决方案

倒着迭代 ，拼接将后面的元素也拼上。

void AWXTArrayActor::WXLoopArray_Right()
{FString JoinedStr;TArray<FString> StrArr = { "Hello","Baby","of","Fuck" };for (int32 Index = StrArr.Num()-1; Index >= 0; --Index) //{if (TEXT("of") == StrArr[Index]){StrArr.RemoveAt(Index);}else{JoinedStr = StrArr[Index] + TEXT(" ")+JoinedStr;}}
}

另开一个存储，要删数组的下标。

void AWXTArrayActor::WXLoopArray_Right2()
{TArray<FString> StrArr = { "Hello","My","Baby","of","Fuck"};TArray<int32> RemoveIndexArray;for (int32 Index = StrArr.Num() - 1; Index >= 0 ;--Index){if (TEXT("of") == StrArr[Index]){RemoveIndexArray.Add(Index);}if (TEXT("My") == StrArr[Index]){RemoveIndexArray.Add(Index);}}for (int32 RemovedLoopIndex = 0; RemovedLoopIndex != RemoveIndexArray.Num(); ++RemovedLoopIndex){StrArr.RemoveAt(RemoveIndexArray[RemovedLoopIndex]);}
}

 四.

1.排序，先看官方文档

2.实现测试用例

这个排序Sort 和 堆排序，不区分大小写。每次排序都差不多一个结果。大小写，他们是一样的。

void AWXTArrayActor::WXSortArray_Sort()
{TArray<FString> StrArr = { "aa","AA","AB","ab","ABC","BB","VE","AA","CCCC","AD","DDDDDDDA"};StrArr.Sort();  //按字典
}void AWXTArrayActor::WXSortArray_HeapSort()
{TArray<FString> StrArr = { "aa","AA","AB","ab","ABC","BB","VE","AA","CCCC","AD","DDDDDDDA" };StrArr.HeapSort();  //按字典
}void AWXTArrayActor::WXSortArray_StableSort()  //稳定排序，有排序后的等值元素的相对顺序
{TArray<FString> StrArr = { "aa","AA","AB","ab","ABC","BB","VE","AA","CCCC","AD","DDDDDDDA" };StrArr.StableSort();  //按字典
}