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<article><h2>Dart mode</h2><form><textarea id="code" name="code">import 'dart:math' show Random;
void main() { print(Die(n: 12).roll());}
// Define a class.class Die { // Define a class variable. static final Random shaker = Random();
// Define instance variables. final int sides; int? lastRoll;
// Define a constructor. Die({int n = 6}) : sides = n { if (4 > n || n > 20) { // Support for errors and exceptions. throw ArgumentError(/* */); } }
// Define a method using shorthand syntax. @override String toString() => '$lastRoll';
// Define an instance method. int roll() { return lastRoll = shaker.nextInt(sides) + 1; }}</textarea></form>
<script> var editor = CodeMirror.fromTextArea(document.getElementById("code"), { lineNumbers: true, mode: "application/dart" });</script>
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