From 2a16800305a075ff76ea3a6c9b9ce6d4c5fdcd48 Mon Sep 17 00:00:00 2001
From: aleclarson <alec.stanford.larson@gmail.com>
Date: Wed, 12 Jul 2017 15:28:59 -0400
Subject: [PATCH] Iterate keys of object when used with `for...in` loop

---
 tags/for.js | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/tags/for.js b/tags/for.js
index de94a7207..a16350718 100644
--- a/tags/for.js
+++ b/tags/for.js
@@ -38,8 +38,10 @@ module.exports = function (liquid) {
     render: function (scope, hash) {
       var collection = Liquid.evalExp(this.collection, scope)
 
-      if (!Array.isArray(collection) ||
-                (Array.isArray(collection) && collection.length === 0)) {
+      if (isObject(collection)) {
+        collection = Object.keys(collection)
+      }
+      if (isEmpty(collection)) {
         return liquid.renderer.renderTemplates(this.elseTemplates, scope)
       }
 
@@ -90,3 +92,18 @@ module.exports = function (liquid) {
     }
   })
 }
+
+function isObject(collection) {
+  if (collection) {
+    const ctr = collection.constructor
+    return ctr === Object || ctr == null
+  }
+  return false
+}
+
+function isEmpty(collection) {
+  if (Array.isArray(collection)) {
+    return !collection.length
+  }
+  return true
+}