List

A list is an array of elements arranged in an ordered sequence.

There are two types of List:

1. Fixed-Length List
2. Growable List

Fixed-Length List is a list that can’t be changed once initialized whereas the Growable list is dynamic in nature.

Fixed-length List

• Creating a Fixed-length List

void main() {
  List<String> list = List(5);
}

The indexing value start with 0 and end with listOfLength-1 . So for the list index values will be 0 to 4 .

• Here the list is empty, so let’s assign the value for each index:

void main() {
  List<String> list = List(5);
  list[0] = 'a';
  list[1] = 'b';
  list[2] = 'c';
  list[3] = 'd';
  list[4] = 'e';
}

• Printing the values:

print(list[1]);

• Updating the value:

void main() {
  List<String> list = List(5);
  list[0] = 'a';
  list[1] = 'b';
  list[2] = 'c';
  list[3] = 'd';
  list[4] = 'e';
  list[0] = 'm';
  print(list[0]);
}

Output:m .

Growable List

• Growable List example:

void main() {
  List<String> list = List();
}

• Inserting elements in List:

void main() {
  List<String> list = List();
  list.add('a');
  list.add('b');
  list.add('c');
}

• Updating element:

void main() {
  List<String> list = List();
  list.add('a');
  list.add('b');
  list.add('c');
  list[1]= 'm';
}