From 78d6611a46f8e6fc8be9fe2b11956df6775d2f48 Mon Sep 17 00:00:00 2001
From: Ilya Matveev <ilya.matveev@jetbrains.com>
Date: Wed, 12 Apr 2017 17:13:48 +0700
Subject: [PATCH] stdlib: Return NaN from average() if the collection is empty

---
 .../main/kotlin/kotlin/collections/Collections.kt    | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/runtime/src/main/kotlin/kotlin/collections/Collections.kt b/runtime/src/main/kotlin/kotlin/collections/Collections.kt
index e1a0e8a01f0..21121c8ac8b 100644
--- a/runtime/src/main/kotlin/kotlin/collections/Collections.kt
+++ b/runtime/src/main/kotlin/kotlin/collections/Collections.kt
@@ -2380,7 +2380,7 @@ public fun Iterable<Byte>.average(): Double {
         sum += element
         count += 1
     }
-    return if (count == 0) 0.0 else sum / count
+    return if (count == 0) Double.NaN else sum / count
 }
 
 /**
@@ -2393,7 +2393,7 @@ public fun Iterable<Short>.average(): Double {
         sum += element
         count += 1
     }
-    return if (count == 0) 0.0 else sum / count
+    return if (count == 0) Double.NaN else sum / count
 }
 
 /**
@@ -2406,7 +2406,7 @@ public fun Iterable<Int>.average(): Double {
         sum += element
         count += 1
     }
-    return if (count == 0) 0.0 else sum / count
+    return if (count == 0) Double.NaN else sum / count
 }
 
 /**
@@ -2419,7 +2419,7 @@ public fun Iterable<Long>.average(): Double {
         sum += element
         count += 1
     }
-    return if (count == 0) 0.0 else sum / count
+    return if (count == 0) Double.NaN else sum / count
 }
 
 /**
@@ -2432,7 +2432,7 @@ public fun Iterable<Float>.average(): Double {
         sum += element
         count += 1
     }
-    return if (count == 0) 0.0 else sum / count
+    return if (count == 0) Double.NaN else sum / count
 }
 
 /**
@@ -2445,7 +2445,7 @@ public fun Iterable<Double>.average(): Double {
         sum += element
         count += 1
     }
-    return if (count == 0) 0.0 else sum / count
+    return if (count == 0) Double.NaN else sum / count
 }
 
 /**