Make life a little more sparkly.

lib/src/utils.dart

Index: lib/src/utils.dart
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index a1e848156506c4872331fdba328ff56e7e6e934a..569a04f626a2877addfc31c05d873d795deccbd9 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -6,6 +6,7 @@
 import 'dart:async';
 import "dart:convert";
 import 'dart:io';
+import 'dart:math' as math;
 
 import "package:crypto/crypto.dart";
 import 'package:path/path.dart' as path;
@@ -34,6 +35,9 @@ const reservedWords = const [
   "var", "void", "while", "with"
 ];
 
+/// An cryptographically secure instance of [math.Random].
+final random = new math.Random.secure();
+
 /// A pair of values.
 class Pair<E, F> {
   E first;
@@ -287,6 +291,10 @@ List flatten(Iterable nested) {
   return result;
 }
 
+/// Randomly chooses a single element in [elements].
+/*=T*/ choose/*<T>*/(List/*<T>*/ elements) =>
+    elements[random.nextInt(elements.length)];
+
 /// Returns a set containing all elements in [minuend] that are not in
 /// [subtrahend].
 Set setMinus(Iterable minuend, Iterable subtrahend) {