How to Reverse a List in Dart

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How to Reverse a List in Dart ?

Answer

To reverse a list in Dart, you can use the reversed property or implement a custom reverse method using nested loops.

✐ Examples

1 Reverse a List Using the reversed Property

In this example,

We create a list named numbers with integer values.
We use the reversed property to get an iterable with elements in reverse order.
We convert the reversed iterable back to a list using the toList method.
Finally, we print the reversed list to standard output.

Dart Program

void main() {
  List<int> numbers = [1, 2, 3, 4, 5];
  List<int> reversedNumbers = numbers.reversed.toList();
  print('Reversed list: \$reversedNumbers');
}

Output

Reversed list: [5, 4, 3, 2, 1]

2 Reverse a List Using a Custom Method

In this example,

We create a list named numbers with integer values.
We implement a custom method called reverseList that takes a list as input.
Inside reverseList, we use a nested loop where the outer loop iterates from the start to the middle of the list, and the inner loop performs the element swap.
The outer loop index i and the inner loop index j represent the positions of elements to be swapped.
We swap the elements at positions i and j until the loop reaches the middle of the list.
Finally, we print the reversed list to standard output.

Dart Program

void main() {
  List<int> numbers = [1, 2, 3, 4, 5];
  reverseList(numbers);
  print('Reversed list: \$numbers');
}

void reverseList(List<int> list) {
  int count = list.length;
  for (int i = 0; i < count ~/ 2; i++) {
    int temp = list[i];
    list[i] = list[count - i - 1];
    list[count - i - 1] = temp;
  }
}

Output

Reversed list: [5, 4, 3, 2, 1]

Summary

In this tutorial, we learned How to Reverse a List in Dart language with well detailed examples.

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How to Reverse a List in Dart

How to Reverse a List in Dart ?

Answer

✐ Examples

1 Reverse a List Using the reversed Property

Dart Program

Output

2 Reverse a List Using a Custom Method

Dart Program

Output

Summary

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