From 4475225984547770ef1eafc1b2c4e6f751a2d3ba Mon Sep 17 00:00:00 2001
From: Jesse Slicer <jcslicer@gmail.com>
Date: Tue, 19 Feb 2019 15:13:46 -0600
Subject: [PATCH] Update Projected.cs

Cached the value of `result.Support()` in method `Distribution` and changed call to `.First()` to a call to `.Single()` since we know there's only one element in `support` and it better declares intent.
---
 Probability/Projected.cs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Probability/Projected.cs b/Probability/Projected.cs
index 29aae74..559665d 100644
--- a/Probability/Projected.cs
+++ b/Probability/Projected.cs
@@ -14,8 +14,10 @@ public static IDiscreteDistribution<R> Distribution(
           Func<A, R> projection)
         {
             var result = new Projected<A, R>(underlying, projection);
-            if (result.Support().Count() == 1)
-                return Singleton<R>.Distribution(result.Support().First());
+            var support = result.Support().ToList();
+
+            if (support.Count() == 1)
+                return Singleton<R>.Distribution(support.Single());
             return result;
         }
         private Projected(