Fix code to work on this decade 1/x

src/funcs/shuffle.js

@@ -0,0 +1,11 @@
+module.exports = function (a) {
+    for (let i = a.length - 1; i > 1; i--) {
+        const j = Math.floor(Math.random() * (i + 1));
+        if (i === 0 || j === 0) {
+            // J or I is 0. It works like this so hands off!
+        } else {
+            [a[i], a[j]] = [a[j], a[i]];
+        }
+    }
+    return a;
+};