list in dart

                                    var fixedLengthList = List<int>.filled(5, 0);
fixedLengthList.length = 0;  // Error
fixedLengthList.add(499);    // Error
fixedLengthList[0] = 87;
var growableList = [1, 2];
growableList.length = 0;
growableList.add(499);
growableList[0] = 87;

                                    import 'dart:core';

void main() {
  
  List<int> intArr = [1,2,3,4,5];
  
  //adding single int to list
  intArr.add(6);
  
  //adding multiple int to list
  intArr.addAll([7,8]);
  
  //adding element or elements to specific location
  //syntax: List.insert(index,value)
  intArr.insert(0,0);
  
  //syntax: List.insertAll(index, iterable_list_of _values)
  intArr.insertAll(0,[-2,-1]); 
  
}

                                    main(List<String> args) {
  //Syntax : List<ValuesDataType> ListName = [Values]
  List<int> x = [10, 20, 30, 50, 70, 90];

  //? printing specific value : print (ListNameHere[ItsArrangeStartFrom0]);
  //! example
  print(x[0]);

  //? printing the whole list : print (ListName)
  print(x);

  //? calculate list values :
  //! example 
  print(x[0] * x[5]);

  //? to add a new value to the list use <ListName>.add(Value);
  //! example 
  x.add(155);
}

                                    var firstList = [1,2,3,4,5,6]; print(firstList.firstWhere((i) => i < 4)); // 1  var sList = ['one', 'two', 'three', 'four']; print(sList.firstWhere((i) => i.length > 3)); // three

                                    -----Fixed Length List----
var list_name = [initial_size];

lst_name[index] = value;

----Growable List------
var list_name = [val1,val2,val3];
OR  
var list_name = []; 

list_name[index] = value;