by @kodeazy

What are the different ways to combine two Lists in flutter?

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In this blog we will discuss on different ways to combine Lists in flutter
Below are the different ways to combine.

Using addAll() function

void main() {
 List l1=[1,2,3];
  List l2=[4,5,6];
  List l3=l1..addAll(l2);
  print(l3);
}

Output

[1, 2, 3, 4, 5, 6]

To combine multiple lists we have expand() function

void main() {
 List l1=[1,2,3];
  List l2=[4,5,6];
  List l3=[7,8,9];
  List l4=[l1,l2,l3].expand((x) => x).toList();
  print(l4);
}

Output

[1, 2, 3, 4, 5, 6, 7, 8, 9]

Using Spread Operator

void main() {
 List l1=[1,2,3];
  List l2=[4,5,6];
  List l3=[7,8,9];
  List l4=[...l1,...l2,...l3];
  print(l4);
}

Output:

[1, 2, 3, 4, 5, 6, 7, 8, 9]

Using + Operator

void main() {
 List l1=[1,2,3];
  List l2=[4,5,6];
  List l3=[7,8,9];
  List l4=l1+l2+l3;
  print(l4);
}

output 

[1, 2, 3, 4, 5, 6, 7, 8, 9]