Dart Fundamentals - Lists - Creating

lists

void main() {
  
  //Fix lengthed list
  var namesFixed = new List<String>(3);
  namesFixed[0] = "Joe";
  namesFixed[1] = "Frankie";
  namesFixed[2] = "Tom";
  //namesFixed[3] = "Kaboom!"; //this would be an error
  log(namesFixed)  ;
  
  //Growable list
  var namesGrowable = new List<String>();
  namesGrowable.add("Joe");
  namesGrowable.add("Frankie");
  namesGrowable.add("Tom");
  namesGrowable.add("Larry");
  log(namesGrowable) ;
  
  //List initialized upfront
  List<String> names = ["Joe", "Frankie", "Tom"];
  log(names);
  names.add("Dave"); //Can add just fine, since this one is growable too!
  log(names);
  
  //Using filled to set placeholder values on a fixed length list of 3
  var namesFilled = new List<String>.filled(3, "placeholder");
  log(namesFilled); //prints placeholder 3 times...
  namesFilled[0] = "Joe"; //Update first entry
  namesFilled[1] = "Frankie"; //Update second entry
  log(namesFilled);
  
  //Using generate (useful to create a long list of something like test data or to call a generator function)
  List<String> namesGenerated = new List<String>.generate(3, (i) => "Name ${i}");
  log(namesGenerated);
}

void log(List<String> lst) {
  lst.forEach((n) => print(n));
  print('=========');
}