Question 295780 in Flutter Question posted in
The official Flutter documentation can be found here.

Sort List of Strings by having a character Flutter

I have a List of strings ["pana", "open","peno","alp","palp"]

and i need to sort them by having the letter "p", then alphabetically:

so the result should be ["pana", "palp","peno", "open","alp"]

How can i do this in Flutter

Tags:

2

Answers


  1. 0

    Try something like this

    List<String> words = ["pana", "open", "peno", "alp", "palp"];

words.sort((a, b) {
    // Custom comparison function
    if (a.contains('p') && !b.contains('p')) {
      // If a has 'p' and b does not, a comes first
      return -1;
    } else if (!a.contains('p') && b.contains('p')) {
      // If b has 'p' and a does not, b comes first
      return 1;
    } else {
      // If both have 'p' or both don't have 'p', compare alphabetically
      return a.compareTo(b);
    }
  });
    Login or Signup to reply.
  2. 0

    This is quite a roundabout way of doing it but:

      var list = [
    "pana",
    "open",
    "peno",
    "alp",
    "palp",
    "kk",
    "can",
    "aaa",
    "111"
    ,"zs",
    "sz",
  ];
  
  var pattern = 'p';
  
  var listStartsWith = list.where((word) => word.startsWith(pattern)).toList()
    ..sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));

  var listContains = list
      .where((word) => word.contains(pattern) && !word.startsWith(pattern))
      .toList()
    ..sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
  
    var listContainsNot = list
      .where((word) => !word.contains(pattern) && !word.startsWith(pattern))
      .toList()
    ..sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));

  var reoderedList = [...listStartsWith, ...listContains, ...listContainsNot];
  
  print(reoderedList);

    I will update once I’ve been able to optimise it but we can work off this for now.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search