1 files changed, 10 insertions, 0 deletions
diff --git a/src/util.js b/src/util.js
index ecae45e..f83039f 100644
--- a/src/util.js
+++ b/src/util.js
@@ -50,3 +50,13 @@ export function apply(f, n, x0) {
     return f(apply(f, n-1, x0));
   }
 }
+
+
+export function shuffle(arr) {
+  const shuffled = [...arr];
+  for (let i=arr.length-1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i+1));
+    [shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]]
+  }
+  return shuffled;
+}