应该使用 List 的哪种方法将两个匹配的单词分配给 value

Question

1.//dart language in Flutter

2.//Which method of list should be used to assign two matching words to the value?

3.//The duplicate value should appear next to its matching value?

//Question: List colour=["peach","red","orange","yellow","white","pink","red","maroon"];

//Answer:

Print ["peach","red","red","orange","yellow","white","pink","maroon"]

Answer 1

There is no 'silver bullet' in List, that is able to solve the task, but it possess several useful methods for the case. There could be several ways to solve the problem. For instance, I'm proposing the remove/insert way:

  List<String> colour = ["peach","red","orange","yellow","white","pink","red","maroon", "pink", "red"];
  for (int i = 0; i < colour.length; i++) {
    int indexOfPossibleDuplication = colour.lastIndexOf(colour[i]);
    if (indexOfPossibleDuplication > i) {
      colour.removeAt(indexOfPossibleDuplication);
      colour.insert(i, colour[i]);
    }
  }
  print(colour); //[peach, red, red, red, orange, yellow, white, pink, pink, maroon]

I deliberately inserted several duplicates to your input example in order to show that the code do the trick in cases, when there is more than one duplication took place.