From bea5554bf0a0cccbc206ed517e853764c00a05d2 Mon Sep 17 00:00:00 2001
From: Travis Nelson <travis.o.nelson@gmail.com>
Date: Mon, 16 Jan 2017 02:38:42 -0700
Subject: [PATCH] Handle undefined arrays better

https://github.com/wycats/handlebars.js/issues/1227

[undefined, undefined] should have the same behavior as new Array(2),
per https://github.com/wycats/handlebars.js/issues/1065
---
 lib/handlebars/helpers/each.js | 2 +-
 spec/regressions.js            | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/handlebars/helpers/each.js b/lib/handlebars/helpers/each.js
index 914928d6d..3f8696ccb 100644
--- a/lib/handlebars/helpers/each.js
+++ b/lib/handlebars/helpers/each.js
@@ -36,7 +36,7 @@ export default function(instance) {
     if (context && typeof context === 'object') {
       if (isArray(context)) {
         for (let j = context.length; i < j; i++) {
-          if (i in context) {
+          if (context[i] !== undefined) {
             execIteration(i, i, i === context.length - 1);
           }
         }
diff --git a/spec/regressions.js b/spec/regressions.js
index 4dc2ac89c..ae0992d44 100644
--- a/spec/regressions.js
+++ b/spec/regressions.js
@@ -288,4 +288,11 @@ describe('Regressions', function() {
 
     shouldCompileTo('{{helpa length="foo"}}', [obj, helpers], 'foo');
   });
+
+  it('GH-1227: Array of undefineds', function() {
+    var array = [undefined, undefined];
+    shouldCompileTo('foo{{#each array}}{{@index}}{{.}}{{/each}}bar', {array: array}, 'foobar');
+    var array2 = new Array(2);
+    shouldCompileTo('foo{{#each array}}{{@index}}{{.}}{{/each}}bar', {array: array2}, 'foobar');
+  });
 });