List.shuffle() in Dart?

Question

I\'m looking every where on the web (dart website, stackoverflow, forums, etc), and I can\'t find my answer.

So there is my problem: I need to write a function, that

Answer 1

Here is a basic shuffle function. Note that the resulting shuffle is not cryptographically strong. It uses Dart's Random class, which produces pseudorandom data not suitable for cryptographic use.

import 'dart:math';

List shuffle(List items) {
  var random = new Random();

  // Go through all elements.
  for (var i = items.length - 1; i > 0; i--) {

    // Pick a pseudorandom number according to the list length
    var n = random.nextInt(i + 1);

    var temp = items[i];
    items[i] = items[n];
    items[n] = temp;
  }

  return items;
}

main() {
  var items = ['foo', 'bar', 'baz', 'qux'];

  print(shuffle(items));
}

Answer 2

There is a shuffle method in the List class. The methods shuffles the list in place. You can call it without an argument or provide a random number generator instance:

var list = ['a', 'b', 'c', 'd'];

list.shuffle();

print('$list');

---

The collection package comes with a shuffle function/extension that also supports specifying a sub range to shuffle:

void shuffle (
List list,
[int start = 0,
int end]
)