From b8695263ee05a29dbdeabdba244432d9b6397a3b Mon Sep 17 00:00:00 2001
From: Talasan Nicholson <talasan.nicholson@gmail.com>
Date: Wed, 30 May 2018 11:07:10 -0500
Subject: [PATCH 1/4] ELO snippet formatting + performance

Not assigning `arr.length` to a variable in a for loop means that the read is done on every iteration.
---
 snippets/elo.md | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/snippets/elo.md b/snippets/elo.md
index 622cdc981..6e36ad874 100644
--- a/snippets/elo.md
+++ b/snippets/elo.md
@@ -15,17 +15,20 @@ const elo = ([...ratings], kFactor = 32, selfRating) => {
   const expectedScore = (self, opponent) => 1 / (1 + 10 ** ((opponent - self) / 400));
   const newRating = (rating, i) =>
     (selfRating || rating) + kFactor * (i - expectedScore(i ? a : b, i ? b : a));
+    
   if (ratings.length === 2) {
     return [newRating(a, 1), newRating(b, 0)];
-  } else {
-    for (let i = 0; i < ratings.length; i++) {
-      let j = i;
-      while (j < ratings.length - 1) {
-        [ratings[i], ratings[j + 1]] = elo([ratings[i], ratings[j + 1]], kFactor);
-        j++;
-      }
+  } 
+  
+  for (let i = 0, l = ratings.length; i < l; i++) {
+    let j = i;
+    
+    while (j < l - 1) {
+      [ratings[i], ratings[j + 1]] = elo([ratings[i], ratings[j + 1]], kFactor);
+      j++;
     }
   }
+  
   return ratings;
 };
 ```

From e4eebca5632227d7912c9fb89846aa3a71503521 Mon Sep 17 00:00:00 2001
From: Angelos Chalaris <chalarangelo@gmail.com>
Date: Sat, 23 Jun 2018 10:17:42 +0300
Subject: [PATCH 2/4] Update elo.md

---
 snippets/elo.md | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/snippets/elo.md b/snippets/elo.md
index 6e36ad874..ad011907d 100644
--- a/snippets/elo.md
+++ b/snippets/elo.md
@@ -15,17 +15,14 @@ const elo = ([...ratings], kFactor = 32, selfRating) => {
   const expectedScore = (self, opponent) => 1 / (1 + 10 ** ((opponent - self) / 400));
   const newRating = (rating, i) =>
     (selfRating || rating) + kFactor * (i - expectedScore(i ? a : b, i ? b : a));
-    
   if (ratings.length === 2) {
     return [newRating(a, 1), newRating(b, 0)];
-  } 
-  
-  for (let i = 0, l = ratings.length; i < l; i++) {
+  }  
+  for (let i = 0, len = ratings.length; i < len; i++) {
     let j = i;
-    
-    while (j < l - 1) {
-      [ratings[i], ratings[j + 1]] = elo([ratings[i], ratings[j + 1]], kFactor);
+    while (j < len - 1) {
       j++;
+      [ratings[i], ratings[j + 1]] = elo([ratings[i], ratings[j + 1]], kFactor);
     }
   }
   

From 5044fc1227315a662637c000c55789489e6d1e0c Mon Sep 17 00:00:00 2001
From: Angelos Chalaris <chalarangelo@gmail.com>
Date: Sat, 23 Jun 2018 10:19:59 +0300
Subject: [PATCH 3/4] Update elo.md

---
 snippets/elo.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/snippets/elo.md b/snippets/elo.md
index ad011907d..6cf448595 100644
--- a/snippets/elo.md
+++ b/snippets/elo.md
@@ -22,7 +22,7 @@ const elo = ([...ratings], kFactor = 32, selfRating) => {
     let j = i;
     while (j < len - 1) {
       j++;
-      [ratings[i], ratings[j + 1]] = elo([ratings[i], ratings[j + 1]], kFactor);
+      [ratings[i], ratings[j]] = elo([ratings[i], ratings[j]], kFactor);
     }
   }
   

From cfda1b7841d08f32c181ff7d94b633b7b4af54a7 Mon Sep 17 00:00:00 2001
From: Angelos Chalaris <chalarangelo@gmail.com>
Date: Sat, 23 Jun 2018 10:20:37 +0300
Subject: [PATCH 4/4] Update elo.md

---
 snippets/elo.md | 1 -
 1 file changed, 1 deletion(-)

diff --git a/snippets/elo.md b/snippets/elo.md
index 6cf448595..1f4207996 100644
--- a/snippets/elo.md
+++ b/snippets/elo.md
@@ -25,7 +25,6 @@ const elo = ([...ratings], kFactor = 32, selfRating) => {
       [ratings[i], ratings[j]] = elo([ratings[i], ratings[j]], kFactor);
     }
   }
-  
   return ratings;
 };
 ```