From 66bd2d14e45c8e802be5616d241b1213a6e69053 Mon Sep 17 00:00:00 2001
From: Dan Fitch <dgfitch@gmail.com>
Date: Mon, 17 Aug 2020 13:01:48 -0500
Subject: [PATCH] Warn if constrained shuffle exceeds the maximum iteration
 number

---
 packages/library/src/util/random/index.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/library/src/util/random/index.js b/packages/library/src/util/random/index.js
index 085cf6186..a4c093413 100644
--- a/packages/library/src/util/random/index.js
+++ b/packages/library/src/util/random/index.js
@@ -162,11 +162,14 @@ export class Random {
 
     // Shuffle until a candidate matches the constraints,
     // or the maximum number of iterations is reached
-    let candidate
-    for (let i = 0; i < maxIterations; i++) {
+    let candidate, i
+    for (i = 0; i < maxIterations; i++) {
       candidate = this.shuffle(a)
       if (constraintChecker(candidate)) break
     }
+    if (i >= maxIterations) {
+      console.warn(`constrainedShuffle could not find a matching candidate after ${ maxIterations } iterations`)
+    }
     return candidate
   }