如何從列表中刪除所有相同的數據<string>除了最后一個？ 與 flutter</string>

Question

我搜索以從列表中刪除所有相同的數據，除了最后一個

我有一個這樣的輸入列表：

[2020-11-04,note0:blabla, ... data_random ... 2020-11-04,note0:srgg, ... data_random ... ,2020-11-15,note0:test, ... data_random ... , 2020-11-15,note0:test1, ... data_random ... , 2020-11-15,note0:test2, ... data_random ... , 2020-11-15,note0:test3]

我搜索只保留最后一個2020-11-15,note0:test3

並刪除2020-11-04,note0:blabla, 2020-11-04,note0:srgg, 2020-11-15,note0:test, 2020-11-15,note0:test1, 2020-11-15,note0:test2

謝謝你

Answer 1

因為它們在“2020-11-15,note0:”中很常見，所以你可以像這樣使用反向 for 循環並檢查它們是否包含：“2020-11-15,note0:”

List keepTheLast() {
List input = [
  "2020-11-15,note0:test",
  "... data_random ... ",
  "2020-11-15,note0:test1",
  "... data_random ...",
  "2020-11-15,note0:test2",
  "... data_random ... ",
  "2020-11-15,note0:test3"
];
bool found = false;
for (int i = input.length - 1; i >= 0; i--)
  if (input[i].contains("2020-11-15,note0:"))
    found ? input.removeAt(i) : found = true;
print(input.toString());
return input;}

res 將是：

 [... data_random ... , ... data_random ..., ... data_random ... , 2020-11-15,note0:test3]