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Dart – Sort a List
  • Last Updated : 15 Jul, 2020

In Dart programming, the List data type is similar to arrays in other programming languages. A list is used to represent a collection of objects. It is an ordered group of objects. The core libraries in Dart are responsible for the existence of List class, its creation, and manipulation. Sorting of the list depends on the type of list we are sorting i.e. if we are sorting integer list then we can use simple sort function whereas if it is a string list then we use compareTo to sort the list.

Sorting an Integer List

An integer list can be sort by the simple sort function.

Example: Sorting an integer list.

Dart

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// Main fumction
main() {
    
  // Creating List
  List<int> geeksforgeeks = [13, 2, -11, 142, -389, 32, 3032, 0];
    
  // Sorting List
  geeksforgeeks.sort();
    
  // Printing Sorted List
  print(geeksforgeeks); 
}

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Output:

[-389, -11, 0, 2, 13, 32, 142, 3032]

Sorting a String List

The string is sorted by comparing the length in the sort function.

Example: Sorting a string list.

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// Main function
main() {
    
  // Creating list of string
  List<String> geeksforgeeks = ['one', 'two', 'three', 'four'];
    
  // Sorting string by comparing the length
  geeksforgeeks.sort((a, b) => a.length.compareTo(b.length));
    
  // Printing the list
  print(geeksforgeeks);
}

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Output:

[one, two, four, three]

If we use sort without comparing the length then:

Example: Sorting a string list without comparing the length.



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// Main function
main() {
    
  // Creating list of string
  List<String> geeksforgeeks = ['one', 'two', 'three', 'four'];
    
  // Sorting string without 
  // comparing the length
  geeksforgeeks.sort();
    
  // Printing the list
  print(geeksforgeeks);
}

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Output:

[four, one, three, two]

Example: Using the cascades method while sorting the list.

Dart

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// Main function
main() {
    
  // Creating list of string
  List<int> geeksforgeeks = [13, 2, -11, 142, -389, 0];
    
  // Sorting string and Printing the list
  print(geeksforgeeks..sort());
}

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Output:

[-389, -11, 0, 2, 13, 142]
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