Question 79740 in Flutter Question posted in
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Dart list get the longest string – Flutter

I want to get first longest string ? How can i do this ?

List<String> list = ['hi', 'hello', 'frozen', 'big mistake', 'cool daddy'];
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4

Answers


  1. 0 
    final longestString = list.fold<String>('', 
  (previousValue, element) => 
    element.length > previousValue.length ? element : previousValue)
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  2. 0

    Check the below function i have done in my project to get the longest string.

    long_string(arr) {
        var longest = arr[0];
        for (var i = 1; i < arr.length; i++) {
            if (arr[i].length > longest.length) {
                longest = arr[i];
            }
        }
        return longest;
    }

    And you can call the function like below to get the longest string

    var arr = ["Orebro", "Sundsvall", "Hudriksvall", "Goteborgsdsdsds"];
  print(long_string(arr));
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  3. 0

    this is the shortest solution, which will return the longest string:

    list.reduce((a, b) {
   return a.length > b.length ? a : b;
})

    another alternative is:

    list.sort((a, b) {
   return b.length - a.length;
});
print(list[0]);
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  4. 0

    The solution posted by Sparko Sol could also be used in an extension on List<String> to make it easier to reuse this method anywhere in the codebase. Such an extension could look something like

    extension Longest on List<String> {
  /// Returns the longest element in a [List<String>]
  String longest() {
    return reduce((a, b) {
      return a.length > b.length ? a : b;
    });
  }
}

    Then, to use this extension, you could simply write something like

    String longestString = list.longest();
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