stringflutteralgorithmsearchflutter-android

Flutter search on random position string

I want to search in a List of Strings, but the search query does not need to be in order as the result.

Let's say I have a list of strings

List<String> a = [
Fracture of right arm, 
Fracture of left arm, 
Fracture of right leg, 
Fracture of left leg,
];

and I want to implement a search filter that when I type fracture right the result would be

Fracture of right leg
Fracture of right arm

How do I do this in Flutter? Because flutter contains() only detects when I type fracture **of** right

Solution

  • You can try this:

    List<String> a = [
    "Fracture of right arm",
    "Fracture of left arm",
    "Fracture of right leg",
    "Fracture of left leg",
  ];
  String query = "fracture right";

  List<String> terms = query.toLowerCase().split(" ");
  List<String> matches = a.where(
    (el) {
      var elLower = el.toLowerCase();
      for (var term in terms) {
        if (!elLower.contains(term)) {
          return false;
        }
      }
      return true;
    },
  ).toList();
  print(matches);

    Note that this will find matches regardless of the order, you can modify it to disallow that.