From 4e6cdab9eeacb63ee548dd76df6dc8c617cbc74c Mon Sep 17 00:00:00 2001
From: Matt Low <matt@mlow.ca>
Date: Thu, 4 Mar 2021 21:35:25 -0700
Subject: [PATCH] Return blank array when requested clues == 0

---
 src/sudoku/math.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/sudoku/math.ts b/src/sudoku/math.ts
index 6e32b87..fdfe125 100644
--- a/src/sudoku/math.ts
+++ b/src/sudoku/math.ts
@@ -158,6 +158,10 @@ export class SudokuMath {
   }
 
   generate(clues: number, attempts = Infinity, totalTime = Infinity) {
+    if (clues === 0) {
+      return Array(this.values2).fill(0);
+    }
+
     let [completed, updates] = this.generateComplete();
 
     const [header, dlxRows] = this.getDLXHeader(); // complete header - no candidates removed