Change new List(n) to return fixed length list.

samples/dartcombat/grids.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dartcombatlib;
 
 /** A boat in the grid. */
 class Boat {
   final int startX;
   final int startY;
   final bool horizontal;
   final int length;
   int hitCount = 0;
 
   Boat(this.startX, this.startY, this.horizontal, this.length) {}
 
   bool get sunk => length == hitCount;
 }
 
 /** Represents a grid configuration. */
 class BoatGrid {
   List<List<Boat>> boatMap;
 
-  BoatGrid() : boatMap = new List.fixedLength(Constants.SIZE) {
+  BoatGrid() : boatMap = new List(Constants.SIZE) {
     for (int i = 0; i < Constants.SIZE; i++) {
-      boatMap[i] = new List.fixedLength(10);
+      boatMap[i] = new List(10);
     }
   }
 
   void placeBoats(List<Boat> boats) {
     for (int b = 0; b < boats.length; b++) {
       Boat boat = boats[b];
       for (int i = 0; i < boat.length; i++)  {
         int x = boat.startX + (boat.horizontal ? i : 0);
         int y = boat.startY + (boat.horizontal ? 0 : i);
         boatMap[x][y] = boat;
@@ skipping 17 matching lines @@
       return b.sunk ? [Constants.SUNK, b.length] : const [Constants.HIT];
     }
   }
 }
 
 /** Represents the current state of a boat grid. */
 class GridState {
   List<List<int>> cells;
 
   GridState()
-      : cells = new List.fixedLength(Constants.SIZE) {
+      : cells = new List(Constants.SIZE) {
     for (int i = 0; i < Constants.SIZE; i++) {
-      cells[i] = new List.fixedLength(10);
+      cells[i] = new List(10);
     }
   }
 
   int valueAt(int x, int y) => cells[x][y];
 
   void miss(int x, int y) {
     cells[x][y] = Constants.MISS;
   }
 
   void hit(int x, int y) {
@@ skipping 13 matching lines @@
 /** Static constants used by the game. */
 class Constants {
   static const SIZE = 10;
   static const MISS = 1;
   static const HIT = 2;
   static const SUNK = 3;
   static const PENDING = 4;
 
   Constants() {}
 }