Sieve of Eratosthenes in Dart. It's a first pass and in desperate need of refactoring but it works for now.

sieve.dart

var expected = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113];

compareLists(lista, listb) {
  if (lista.length == listb.length) {
    for(var i = 0; i < lista.length; i ++) {
      if (lista[i] != listb[i]) {
        return false;
      }
    }
    return true;
  }
  else {
    return false;
  }
}

range_of_bools(end) {
  var ls = [];
  for (var i = 0; i < end; i++) {
  print('adding ${i}');
    ls.add(true);
  } 
  return ls;
}

bool_list_to_integer_list(list) {
  var ls = [];
  for(var i = 0; i < list.length; i++) {
    if (list[i]) {
      print('${i}');
      ls.add(i);
    }
  }
  return ls;
}

sieve_of_e(n) {
  var primes = range_of_bools(n);
  primes[0] = false;
  primes[1] = false;
  print('primes ${primes.length}');
  for(var p = 2; p < n; p++) {
    for(var i = p; i < n; i++) {
      if (p * i < n) {
        print('falsing ${p*i}');
        primes[p * i] = false;
        print('done');
      }
    }
  }
  return primes;
}
main() {
  var primes = sieve_of_e(120);
  if (compareLists(bool_list_to_integer_list(primes), expected)) {
    print('Sieve is working :) !');
  }
  else {
    print('Sieve failed :( !');
  }
}