From dabef4ecf33a4138bc467539efc48da224cc8205 Mon Sep 17 00:00:00 2001
From: Luisav1 <luisa.vargassuarez@ucalgary.ca>
Date: Thu, 9 Jun 2022 16:09:46 -0600
Subject: [PATCH] Changed an error to an assertion that prints out the type of
 unexpected particle. See
 https://github.com/phetsims/build-a-nucleus/issues/18.

---
 js/model/ParticleAtom.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/model/ParticleAtom.js b/js/model/ParticleAtom.js
index adda1e1..a3cc18d 100644
--- a/js/model/ParticleAtom.js
+++ b/js/model/ParticleAtom.js
@@ -380,7 +380,7 @@ class ParticleAtom extends PhetioObject {
 
     }
     else {
-      throw new Error( 'Unexpected particle type.' );
+      assert && assert( false, 'Unexpected particle type ' + particle.type );
     }
   }