From 0410484f906c348b73a99f4b06b65962a425b164 Mon Sep 17 00:00:00 2001
From: Christophe Grand <christophe@cgrand.net>
Date: Wed, 13 Jun 2018 23:08:05 +0200
Subject: [PATCH] v0.18.1: new avg semantics on empty inputs (emits nil)

---
 README.md                      | 2 +-
 project.clj                    | 2 +-
 src/net/cgrand/xforms/rfs.cljc | 7 ++++---
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 19402cb..03f9d4e 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ In `net.cgrand.xforms.io`:
 Add this dependency to your project:
 
 ```clj
-[net.cgrand/xforms "0.16.0"]
+[net.cgrand/xforms "0.18.1"]
 ```
 
 ```clj
diff --git a/project.clj b/project.clj
index 43e9cce..66ed108 100644
--- a/project.clj
+++ b/project.clj
@@ -1,4 +1,4 @@
-(defproject net.cgrand/xforms "0.18.0"
+(defproject net.cgrand/xforms "0.18.1"
   :description "Extra transducers for Clojure"
   :url "https://github.com/cgrand/xforms"
   :license {:name "Eclipse Public License"
diff --git a/src/net/cgrand/xforms/rfs.cljc b/src/net/cgrand/xforms/rfs.cljc
index 4a18a85..7635912 100644
--- a/src/net/cgrand/xforms/rfs.cljc
+++ b/src/net/cgrand/xforms/rfs.cljc
@@ -59,9 +59,10 @@
   ([^doubles acc] (when acc (/ (aget acc 1) (aget acc 0))))
   ([acc x] (avg acc x 1))
   ([^doubles acc x w] ; weighted mean
-    (doto (or acc #?(:clj (double-array 3) :cljs #js [0.0 0.0]))
-      (aset 0 (+ (aget acc 0) w))
-      (aset 1 (+ (aget acc 1) (* w x))))))
+    (let [acc (or acc #?(:clj (double-array 3) :cljs #js [0.0 0.0]))]
+      (doto acc
+        (aset 0 (+ (aget acc 0) w))
+        (aset 1 (+ (aget acc 1) (* w x)))))))
 
 (defn sd
   "Reducing fn to compute the standard deviation. Returns 0 if no or only one item."