Question 202457 in Flutter Question posted in
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Flutter – Issue on Declaration of List in Dart language

I am using VS code
when I create List without assigning values …the compiler throw Error: Couldn’t find constructor ‘List’:
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I tried to declare fixed length List but error occurs .please one can fix this I am beginner.

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2

Answers


  1. 0

    It’s not the correct syntax for the dart.

    Here is the way you do this:

    void main() {
  List<int?> lst = List<int?>.filled(3, null);
  lst[0]=1;
  lst[1]=2;
  lst[2]=3;
  print(lst.runtimeType);  
  print(lst);
}

    For more read documentation.

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  2. 0

    you implement wrong syntax in dart so correct syntax way is.

    void main() {
  List<int> list =  [];
  list.add(11);
  list.add(12);
  list.add(13);
  print('list: $list');
}

o/p:  list:  [11, 12, 13]

    2nd way is

    List mList = List.filled(5, null, growable: false);
mList[0] = 12;
mList[1] = 22;
mList[2] = 33 ;
print(mList)

o/p: [12, 22, 33, null, null]
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